The Lifetime Professional Achievement Award is the highest honor given by the INFORMS Simulation Society. The award recognizes major contributions to the field of simulation that are sustained over most of a professional career, with the critical consideration being the total impact of these contributions on the field. The 2011 LPAA Selection Committee consisted of Averill M. Law (chair), Reuven Rubinstein, and Enver Yücesan.

This year’s winner is Dr. Peter A.W. Lewis (1932-2011), who was Distinguished Professor of Statistics and Operations Research at the Naval Postgraduate School. He was a leader in the fields of computer simulation, applied statistics and probability, and operations research. Peter’s work on simulation theory and methodology encompassed the areas of input modeling (time-series models and non-stationary point processes), random-number generation, variance-reduction techniques, and output-data analysis (regenerative method and quantile estimation).

Peter’s service to the international simulation community included persuading the American Statistical Association (ASA) to become a sponsor of WSC in the mid-1980s, and then serving on the WSC Board of Directors as ASA’s representative from 1986 to 1989. A common theme running through the comments about Peter Lewis by many of his colleagues and former students is his extraordinary influence on their professional careers and his steadfast encouragement and support of their work.

Peter was elected Fellow of the International Statistical Institute, the Institute of Mathematical Statistics, and the ASA.

Reuven Rubinstein Receives the 2010 Lifetime Professional Achievement Award from the INFORMS Simulation Society

Left to right: Enver Yucesan, Reuven Rubinstein, Peter Haas

The Lifetime Professional Achievement Award is the highest honor given by INFORMS Simulation Society. The award recognizes major contributions to the field of simulation that are sustained over most of a professional career, with the critical consideration being the total impact of those contributions on the field.

The LPAA Selection Committee consists of Enver Yücesan (chair), Richard E. Nance, and Averill M. Law. This year’s winner of the LPAA is Professor Reuven Rubinstein of the William Davidson Faculty of Industrial Engineering and Management at Technion. Professor Rubinstein has received his PhD in Operations Research at Rigas Polytechnical Institute in Latvia in 1969. He has joined Technion in 1973. Over the years, he has held many visiting positions in Europe, in North America, in South Africa, Japan and New Zealand. He has served as an editor in Stochastic Models, Methodology and Computing in Applied Probability, and Annals of Operations Research.

“Professor Rubinstein has been a pivotal figure in the theory and practice of simulation as we know it today. His career reflects a high level of creativity and contribution, with a willingness to explore new areas and an amazing ability to suggest surprising new avenues of research and to influence subsequent work.”

Averill M. Law Receives the 2009 Lifetime Professional Achievement Award from the INFORMS Simulation Society

Let to right: Richard Nance and Averill Law

Averill M. Law, President of Averill M. Law & Associates, received the 2009 Lifetime Professional Achievement Award from the INFORMS Simulation Society. The award was presented at the opening session of the Winter Simulation Conference, which was held on December 14, 2009 in Austin, TX.

He is best known for his textbook Simulation Modeling and Analysis, which is now in its fourth edition. (The first three editions were co-authored with W. David Kelton.) It is arguably the all-time, most-successful book on simulation with more than 125,000 copies in print, and widely used in university courses, by simulation practitioners, and for self study.

Dr. Law has been the leading educator on simulation methodology and practice since 1977, having presented more than 475 short courses on all aspects of simulation in 18 countries, and attended by 7000 practitioners, faculty members from leading universities, and graduate students alike. He also taught simulation for 17 years at the University of Wisconsin-Madison and the University of Arizona.

He has made significant research contributions in many areas of simulation, such as output data analysis, comparing alternative system configurations, variance-reduction techniques, selecting input probability distributions, model validation, and manufacturing-system analysis. This research was funded by the Office of Naval Research, the Defense Modeling and Simulation Office, the Navy Modeling and Simulation Office, and the National Institute of Standards and Technology, and was published in journals such as Operations Research, Management Science, Naval Research Quarterly, and Communications in Statistics. His paper "Statistical Analysis of Simulation Output Data" was the first invited feature paper on simulation to appear in a major research journal.

He has been a long-time supporter of the Winter Simulation Conference, having presented at least one tutorial or paper every year since 1976.

Richard E. Nance Receives the 2007 Lifetime Professional Achievement Award from the INFORMS Simulation Society

Left to right: Robert Sargent, Richard Nance and Jack Kleijnen

Professor Emeritus Richard E. Nance of Virginia Tech was presented with the INFORMS Simulation Society's highest honor, the Lifetime Professional Achievement Award (LPAA) at this year's Winter Simulation Conference, December 9-12, 2007, Washington, D.C.

Dick has made numerous outstanding contributions to the simulation profession (and related fields) over his thirty-five plus years as a professional. He was one of the foremost leaders in bringing simulation into the leading professional journals. He was the individual who brought simulation into IIE Transactions and into Operations Research when he included simulation in the departments (areas) that he served as department/area editor for these two journals. This led to individual departments (areas) being established for simulation only in these journals. Dick also initiated the establishment of ACM TOMACS and served as the first Editor-in-Chief. In addition, Dick has served on several editorial boards and as associate editors for a number of journals; and as a co-editor of special journal issues on simulation.

Dick has also made major service contributions beyond his editorial work. He served as President of what is now called the INFORMS Simulation Society and was a WSC Board Representative. He served as the program chair of WSC 1990 and was one of the Founding Trustees of the WSC Foundation. For ACM, Dick was Chair of SIGSIM, Chair of SIGIR, and Chair of numerous committees.

Dick has also made major contributions in research as shown through his publications and his work with students; in practice through his work with the U.S. Navy and consulting; in dissemination of knowledge through his teaching, presentations, publications, and editorial work; in development of simulation software through his work in developing modeling environments and the conical framework; and in advancement of the status and visibility of simulation through his society work, editorial work, numerous presentations, and work with a variety of industrial and government organizations.

Dick has received several awards and honors. To mention some, he is a Fellow of ACM; has received service awards from TIMS College on Simulation (what is now called the INFORMS Simulation Society), ACM SIGSIM, U.S. Naval Surface Weapons Center, and the WSC Board of Directors; has received the Military Operations Research Society Medal; and is a member of honor societies. Dick also held the John Adolphus Dahlgren Chair of Naval Computing Systems at Virginia Tech.

The unanimous decision of the award committee was based on Dick's resume and very strong supporting letters from outstanding members of the international simulation community. The committee and letter writers all agree that Dick is an excellent researcher, educator, and leader of the international simulation community who is well-worthy of the Lifetime Professional Achievement Award. As one letter writer noted, Dick is truly a "giant of simulation."

Jack. P.C. Kleijnen Receives the 2005 Lifetime Professional Achievement Award from the INFORMS Simulation Society

Left to right: Lee Schruben and Jack Kleijnen

Professor Jack. P.C. Kleijnen of Tilburg University, the Netherlands, was presented with the Informs Simulation Society's highest honor, the Lifetime Professional Achievement Award at this year's Winter Simulation Conference, December 4th through 7th in Orlando Florida. Unrelated to this award, there was a special research track in tribute to Professor Kleijnen at the Conference, where he was further recognized by being a speaker at the Titan's of Simulation honorary assembly.

Professor Kleijnen has excelled in many of the criteria that are qualifications for this award and made significant contributions to the field of simulation and in other areas for more than 40 years. His published work includes 6 books and almost 200 papers, many receiving awards. Jack was described in one of the nomination's supporting letters as "a true pioneer in simulation research". Another endorsement letter said: "keeping track of Jack Kleijnen's research is close to a fulltime job."

Professor Kleijnen has also distinguished himself in his service to the profession. Jack is the only person in recent memory to have received an Operations Research Meritorious Service Award two years in a row for his editorial and refereeing work - in two different areas!

All the writers of supporting letters mentioned Professor Kleijnen's direct and personal influence on their careers. One of Jack's most notable traits is his consistent energy and infectious enthusiasm for simulation. As noted in one letter, Jack has a "downright charming and genuine fascination with new ideas." All who know Jack will agree with the remark in another supporting letter that points to Jack's constant level of enthusiasm and prolific work both within simulation and in other areas, calling him simulation's "great ambassador".

George S. Fishman Receives the 2004 Lifetime Professional Achievement Award from the INFORMS Simulation Society

Left to right: George S. Fishman and Robert G. Sargent

George S. Fishman, professor emeritus of operations research in The University of North Carolina at Chapel Hill, received the 2004 Lifetime Professional Achievement Award from the INFORMS Simulation Society. The award was presented at the opening session of the 2004 Winter Simulation Conference, which was held in Washington, D.C., on December 6, 2004. The award selection committee for 2004 was chaired by Robert G. Sargent (Syracuse University), with members Thomas J. Schriber (University of Michigan) and Lee W. Schruben (University of California, Berkeley).

The highest honor of the INFORMS Simulation Society, the Lifetime Professional Achievement Award is given at most annually to recognize an individual for major contributions to the field of simulation that are sustained over most of a professional career, with the critical consideration being the total impact of those contributions on computer simulation. An individual’s achievements may fall in one or more of the following categories:

1. contributions to research,
2. contributions to practice,
3. dissemination of knowledge,
4. development of software or hardware,
5. service to the profession, and
6. advancement of the status or visibility of the field.

The period of professional accomplishment for a recipient should normally be at least twenty years.

George Fishman is one of the pioneers in the field of discrete-event stochastic simulation, having inaugurated the use of rigorous approaches to the development of statistical methods for simulation during the 1960s while he was working at the Rand Corporation and simultaneously earning his Ph.D. degree in biostatistics from the University of California at Los Angeles. (He received a master’s degree in economics from Stanford University in 1963 and a bachelor’s degree in economics from the Massachusetts Institute of Technology in 1960.) After receiving his Ph.D. in 1970, George served on the faculty of Yale University for four years; and in 1974 he joined the faculty of The University of North Carolina at Chapel Hill, where he has spent the rest of his professional career.

George Fishman has made numerous major contributions to simulation research over the past five decades; and in the process he performed a key role not only in shaping the research agenda for the field of simulation but also in setting the standards for high-quality research in the field. In the area of simulation output analysis, George pioneered the use of spectral analysis and the autoregressive method; he cointroduced the regenerative method; he performed groundbreaking analysis of the method of batch means; and he formulated new algorithms for batch means and implemented those procedures in software for large-scale practical applications. In the area of random-number generation, George performed comprehensive empirical analyses of random-number generators; and he introduced new performance measures for evaluating the behavior of those generators. This research stimulated the development of substantially better random-number generators for practical applications. George also made significant contributions to the allied area of (nonuniform) random-variate generation.

Another major focus of George’s research is computational and statistical efficiency in simulation. He introduced new methods for efficiency improvement and variance reduction in the design, execution, and analysis of computer simulation experiments. George has developed several methods for efficient simulation and performance evaluation of stochastic networks, Markov chains, and other probabilistic models that commonly arise in operations research.

George has written six books. Two of these books deserve special comment. His 1973 book, Concepts and Methods in Discrete Event Digital Simulation, was one of the first comprehensive books on all aspects of simulation, providing thorough coverage of such topics as the modeling of systems, developing simulation programs, and analyzing simulation output. His 1996 book, Monte Carlo: Concepts, Algorithms, and Applications, received the 1996 Frederick W. Lanchester Prize from INFORMS as well as the 1997 Outstanding Simulation Publication Award from the INFORMS College on Simulation.

George has disseminated knowledge about simulation well beyond the seventy-plus research articles and the six books that he has written. Over the past five decades, he has presented numerous papers at professional conferences and has given seminars at universities around the world. George has also written several papers on the applications of simulation in a broad diversity of disciplines.

George has performed substantial service to the field of simulation, and for this he received the 1990 Distinguished Service Award from the INFORMS College on Simulation. He served as president of TIMS College on Simulation and Gaming (now the INFORMS Simulation Society) from 1972 to 1974. George served as the first editor of the Simulation Department of Management Science during the period 1978–1987. As the Simulation Department Editor of Management Science, George exercised a decisive influence in establishing the standards for archival research publications in simulation—a highly controversial topic in the late 1970s and early 1980s. He served on the Board of Directors of the Winter Simulation Conference (1978–1980) and on the Editorial Advisory Board of ACM Transactions on Modeling and Computer Simulation (1989–1992). He has also served on numerous committees of professional societies and international conferences. George Fishman’s contributions to the field of simulation in leadership and service have substantially advanced the field over the past forty-plus years, especially during the 1970s.

George has also been a leader in operations research education. He exerted remarkable leadership in advancing Operations Research at The University of North Carolina at Chapel Hill, including helping to establish the Department of Operations Research and serving as chair of that department for a decade. George served as the adviser to numerous master’s and doctoral students, and he served on the advisory committees of many more master’s and doctoral students.

In summary, George S. Fishman has made exceptional contributions to the field of discrete-event simulation through his research, dissemination of knowledge, leadership, and service. Several letters of endorsement from distinguished individuals accompanied George’s nomination for the Lifetime Professional Achievement Award. Two themes running through all these letters are that George has had an amazing amount of productivity and that he is a world-class scholar, researcher, and leader in the field of simulation and in the larger fields of operations research and the management sciences. George Fishman’s career epitomizes the highest ideals of the Lifetime Professional Achievement Award of the INFORMS Simulation Society.

Robert G. Sargent Receives the 2002 Lifetime Professional Achievement Award from the INFORMS-College on Simulation

Left to Right: Thomas Schriber and Robert G. Sargent

Robert G. Sargent, Professor Emeritus of Electrical Engineering and Computer Science at Syracuse University, received the 2002 Lifetime Professional Achievement Award from the Institute for Operations Research and the Management Sciences-College on Simulation (INFORMS-CS). The award was presented to Dr. Sargent at the Opening Session of the 2002 Winter Simulation Conference, which was held in San Diego, California, on December 9, 2002.

The Lifetime Professional Achievement Award is the highest honor given by INFORMS-CS, and it is given at most once a year. The award recognizes major contributions to the field of simulation that are sustained over most of a professional career, with the critical consideration being the total impact of those contributions on the field. An individual's contributions may fall in one or more of the following areas:

1. contributions to research,
2. contributions to practice,
3. dissemination of knowledge,
4. development of software or hardware,
5. service to the profession, and
6. advancement of the status or visibility of the field.

The period of professional accomplishment for a recipient of the award should normally be at least twenty years. In 2002 the award selection committee was chaired by James R. Wilson (North Carolina State University), with Thomas J. Schriber (The University of Michigan) in his initial year of service and Julian Reitman (University of Connecticut, Stamford) completing his final year of service on the committee.

Bob Sargent first became involved with discrete-event simulation in the early 1960s as a graduate student at The University of Michigan, where he studied simulation methodology and developed simulation models. After completing his Ph.D. at Michigan in 1966, Bob joined the faculty at Syracuse University and taught simulation there until he retired in the late 1990s. Bob contributed significantly in several areas of simulation during his professional career. He made important research contributions to simulation methodology, many having a practical flavor. His sustained service to the simulation profession is well known and has been formally recognized with several service awards. He disseminated information about simulation and advanced its visibility through numerous presentations and tutorials at major international conferences and through his work with the U.S. Air Force. Bob was also one of the first individuals to initiate the modeling of computer systems for performance evaluation. His most significant professional achievements in simulation are detailed below.

1. Contributions to Research
Bob has made major research contributions in several areas of simulation methodology.

• In the modeling area, he coauthored the definitive paper on hybrid analytic/simulation modeling. He made important contributions subsequent to the original development of Event Graph Models, which are graphical representations of the event world view. Bob led the development of Control Flow Graph Models, which are graphical representations of the process world view. He and one of his students later extended these graphical representations by evolving Hierarchical Control Flow Graph Models to facilitate development, maintenance, execution, and reuse of complex simulation models. Bob and another of his students updated and extended the experimental frame concept.
• In the area of computational speedup of simulation model execution, he and his students made contributions to event-list processing, the use of associative processors (associative processing), and the use of parallel computers (parallel simulation).
• In the output analysis area, Bob's contributions include the following: development of new statistical estimators; a comprehensive theoretical and experimental comparison of confidence interval estimators; creation of a methodology for fitting and validating metamodels that use different types of basis functions; and the development of the cyclic regenerative method.
• In the verification and validation (V&V) area, he raised the visibility and understanding of the roles of verification and validation and the distinction between them. He developed a graphical view of how V&V relates to the modeling process, which is known as the "simplified view of the modeling process," and which has become widely used. He and a student developed a statistical framework within which to view validation. He also developed numerous validation techniques, approaches, and methodologies.
• In the area of the theory of simulation, he and a student developed a general framework for discrete-event modeling and simulation based on formal logic.

2. Contributions to Practice
Bob was involved with some of the first data collection, data analysis, and modeling of computer systems for performance evaluation. Some of this work is contained in his publications. Much of Bob's research work was directed toward obtaining results that can be used by practitioners. Furthermore, he worked with the U.S. Air Force on military problems, as well as serving on some Department of Defense committees.

3. Dissemination of Knowledge
Bob has been an active disseminator of simulation knowledge to practitioners and researchers alike. He started giving tutorials on "Introduction to Simulation Languages" and "Output Analysis" in the 1970s and later gave tutorials on "Verification and Validation." These presentations were made at Winter Simulation Conferences (WSCs); Symposia on the Simulation of Computer Systems; NATO meetings; joint international conferences of The Institute of Management Sciences (TIMS) and the Operations Research Society of America (ORSA) [now merged to form the Institute for Operations Research and the Management Sciences (INFORMS)]; meetings of local professional societies; and seminars at universities. Bob also disseminated state-of-the-art knowledge on simulation through numerous presentations at conferences and universities around the world. He was a coeditor of the 1976 and 1977 Proceedings of the Winter Simulation Conference; coeditor of a special issue of Operations Research on simulation, (1983, Vol. 31, No. 6); and coauthor of state-of-the-art bibliographies. He was a National Lecturer with the Association for Computing Machinery (ACM) during the period 1985-1989, giving numerous talks on simulation at ACM chapters. In addition, he taught simulation credit-courses at Syracuse University for over thirty years; and he chaired the dissertations of nine Ph.D. students, six of whom did their Ph.D. work in the area of simulation.

4. Development of Software Bob and his students developed prototype simulation systems, including the Hierarchical Modeling and Simulation System-Java (HiMASS-j), to demonstrate the concept and workability of using the paradigm of the Hierarchical Control Flow Graph Model together with visual interactive simulation model building and an updated approach to experimental frames. Some of these developments were done on behalf of the U.S. Air Force.

5. Service to the Profession
Bob made many significant service contributions to the simulation community in a variety of areas. Bob was and still is very active in TIMS/College on Simulation and Gaming, now known as INFORMS-College on Simulation. He held all the offices in the College, including the position of president (1978-1980). He served on most of the College's committees, and was involved in establishing all the awards given by the College.

Bob's contributions in service to WSC over the past four decades deserve special mention. He was the representative of the Institute of Industrial Engineers (IIE) to the conference committee of each annual WSC from 1974 to 1984. Bob was instrumental in initiating the rebirth of WSC in 1976, serving as the Associate Program Chair for the 1976 WSC, and then as the General Chair for the 1977 WSC. He played a key role in the establishment of the WSC Board of Directors; and he drafted a set of bylaws for the WSC Board, coordinating three revisions of that document that culminated in final Board of approval of its by-laws in 1979. Bob also formulated the duties of the various officers of the Board. He continued as the IIE representative to the Board from 1976 to 1984, and he served as Board Chair from 1979 to 1981. Bob has also served various annual WSCs as a track coordinator and session organizer.

Bob's editorial work is commensurate with the other dimensions of his service to the simulation community. He helped establish the Simulation Department of Management Science in the mid-1970s; and then he played a critical role in saving that department from closure on three separate occasions in the late 1970s and the early 1980s. He was the Departmental Editor for Simulation Modeling and Statistical Computing (Research Contributions) of the Communications of the ACM, serving from 1980 to 1985. Bob was involved in establishing the ACM Transactions on Modeling and Computer Simulation (TOMACS); and he served on the TOMACS Editorial Advisory Board from 1989 to 1997. Over the years, he served as a referee for numerous archival journals in the fields of industrial engineering, operations research, and computer science. For the special fiftieth anniversary issue of Operations Research (2002, Vol. 50, No. 1), Bob coauthored an invited article on the past, present, and future of the field of simulation that was titled "Perspectives on the Evolution of Simulation."

Bob service to the simulation community has spanned numerous professional societies and major international conferences. Bob gave the Keynote Address at the 1998 Conference on Simulation and Visualization (in Magdeburg, Germany); and he gave the Doctoral Colloquium Keynote Address at the 2000 WSC. He was a Director-at-Large of the Society for Computer Simulation (now the Society for Modeling and Simulation International, or SCS) from 1984 to 1987; he was a member of the Executive Committee for Simulation of the Institute of Electrical and Electronics Engineers (IEEE) Computer Society for several years; and he was an active member of the ACM Special Interest Group on Simulation (SIGSIM), serving on committees and performing various tasks. Bob organized numerous sessions on simulation at various national and international meetings. Bob has also provided service to the National Science Foundation, much of which had to do with the field of simulation. In addition, he served various professional societies in areas other than simulation. For his service work, Bob received awards from the following organizations: ACM; IIE; the WSC Board of Directors; and the INFORMS-College on Simulation (in particular, he received the College's Distinguished Service Award in 1988).

6. Advancement of the Visibility of Simulation
Over the past four decades, Bob has increased the visibility of simulation through his numerous presentations at a broad range of professional meetings-in particular, the national and international conferences of ACM, IEEE, IIE, INFORMS, and SCS-and in his work with the U.S. Air Force, where he promoted simulation as a problem solving technique.

7. Summary
The nomination of Bob Sargent for the INFORMS-CS Lifetime Professional Achievement Award was accompanied by letters of endorsement from ten distinguished individuals who can evaluate authoritatively various facets of Bob's remarkable career. A common theme running through the ten letters of endorsement is that in all his professional activities, Bob has set a standard for uncompromising integrity and a commitment to excellence that many people in the international simulation community have tried to emulate. Perhaps Lee Schruben expressed this sentiment most forcefully in his letter of endorsement:

At critical points in my career and life, he has been the most supportive voice. Above all else, Bob is always the teacher. He is direct but constructive in his criticisms, and with high but attainable standards. Even after losing an argument with Bob, he somehow makes me feel better than before the exchange. In academics, where arrogance and negativity often mask themselves as a commitment to high standards, Bob stands out as positive, able to see and add value. He tries to look for what is right as well as what may be wrong with any new idea. There are several lines of research that I would have abandoned without Bob's encouragement and some that I did abandon, or should have, for lack of it.

If it is possible for someone to be everyone's friend, then Bob has done it by being a best friend to our profession. I am happy to count him among mine. Bob's accomplishments stem from one core value: he cares, and by doing so makes us all care.

Bob Sargent's career epitomizes the highest ideals of the Lifetime Professional Achievement Award of the INFORMS-College on Simulation; and it was with great pride that the selection committee presented the award to him.

Tom Schriber Receives the 2001 Lifetime Professional Achievement Award from the INFORMS-College on Simulation

Left to right: Tom Schriber and Julian Reitman

The Lifetime Professional Achievement Award is the highest honor given by the Institute for Operations Research and the Management Sciences (INFORMS)-College on Simulation. Given at most once a year, the award recognizes major contributions to the field of computer simulation that are sustained over a professional career. The winner may qualify based on one or more of the following six areas:

• research,
• practice,
• dissemination of knowledge,
• development of software or hardware,
• service to the profession, and
• advancement of the status or visibility of the field.

In 2001 the award selection committee was chaired by Julian Reitman (University of Connecticut, Stamford), with James R. Wilson (North Carolina State University) in his initial year of service and David Goldsman (Georgia Tech) completing his final year of service on the committee.

Thomas J. Schriber, the winner of this year's award, has made remarkable contributions in all the categories listed above. Tom became involved with discrete-event simulation research when he joined the faculty of the University of Michigan Business School in 1966; and he has subsequently introduced many thousands of people to simulation throughout the world. Tom is perhaps best known for his landmark textbook, Simulation Using GPSS, which was first published in 1974. Also known as the "Red Book," this classic text had 38 printings totaling 40,000 copies during the period 1974-1988; and since 1980 the Russian translation of this book, naturally called the "Red Red Book," has sold over 10,000 copies.

Since the mid-1960s Tom has promoted simulation around the globe-from behind the former Iron Curtain to Chile, Mexico, the Netherlands, Korea, and many other countries. Tom is truly the ambassador to the world for the field of simulation. He loves to teach; and he is particularly highly regarded for his tutorials and national lectures, both in academic and industrial settings. Tom's service to the profession extends to the Winter Simulation Conference, where for many years he served on the Board of Directors as the representative of the Association for Computing Machinery (ACM). He has also been an associate editor for numerous scholarly journals. Tom has made outstanding contributions to simulation research in a broad range of areas, including simulation output analysis, simulation modeling and language development, and the application of simulation to the design and control of production and transportation systems. Tom has disseminated this knowledge at all levels of academia, government, and industry via his many books, speeches, mentoring of students and colleagues, and academic leadership. Tom Schriber's career epitomizes the highest ideals of the Lifetime Professional Achievement Award of the INFORMS-College on Simulation.

Alan Pritsker Receives the 1999 Lifetime Professional Achievement Award from the INFORMS-College on Simulation

Presentation Remarks of David Goldsman

Tonight I would like to honor Alan Pritsker with the presentation of the INFORMS College on Simulation's Lifetime Professional Achievement Award --- here in the informal atmosphere of the College business meeting.

The Award recognizes major contributions to the field of computer simulation that are sustained over a professional career. The winner may qualify based on one or more of six areas:

• research,
• practice,
• dissemination of knowledge,
• development of software or hardware,
• service,
• advancement of the status of the field.

Alan is that rare individual who could have won the Award based on his contributions in *any* of the areas, let alone all six!

Let me start by putting giving some examples showing how longstanding Alan's commitment to simulation has been --- easily over 40 years ---

• from fighting to use simulation for research and consulting at Battelle
• to teaching and developing simulation languages at ASU
• to advancing the state-of-the-art in research and language development at Purdue and Pritsker and Associates
• to leading projects of major societal importance.

I will now touch on just a few of the accomplishments that exemplify Alan's impact on our profession.

Leadership in Professional Societies. By his leadership in various professional societies and governmental organizations over the past 40 years, Alan has contributed significantly to the dramatic growth of the field of simulation as well as the larger fields of IE and OR. To this end, Alan was awarded the Frank and Lillian Gilbreth Industrial Engineering Award in 1991. Its citation reads: This award is the highest and most esteemed honor presented by the IIE and recognizes individuals who have distinguished themselves through contributions to the welfare of mankind in the field of industrial engineering. The contributions are of the highest caliber and are nationally and internationally recognized. Alan also enjoys the singular distinction of being the only individual in IIE's history to be honored with a special issue of IIE Transactions on the occasion of that person's retirement --- that issue will be published next year.

Of course, Alan has also served the Winter Simulation Conference in many capacities, most notably as WSC Board representative from IIE and our College over the years.

Leadership in the National Academy of Engineering. The NAE is an organization of national importance and influence --- both on the educational and political sides of things. Alan was the second industrial engineer to be elected to the Academy. He has since served the Academy in many capacities. Perhaps most important to us, he has encouraged the Academy to elect other IE's, and so has directly enhanced the importance of our field on the national level.

Research and Teaching. Alan is recognized world-wide for his advancement of the theory and methodology of discrete and combined simulation, as well as simulation environments. Alan is also widely known for his work in simulation output analysis and variance reduction techniques. Even now, Alan is developing new ranking and selection methods to select the best of a number of alternative simulation scenarios with precise statistical guarantees.

Alan loves to teach and mentor students at all levels. He has also produced a progeny of exceptional Ph.D. students --- among them,

• Hank Grant, Southwestern Bell Professor at The Univ. of Oklahoma
• Hamdy Taha, University Professor at The Univ. of Arkansas
• Gary Whitehouse, Provost, University of Central Florida
• Jim Wilson, Chair of IE at North Carolina State
• Nick Hurst, General, US Army.

Applications. Alan's work is driven by real-world practice. He has made countless contributions in this regard. Two examples are his work with policy analysis for organ transplantation, and, in the area of manufacturing, real-time factory control.

Over the past five years, Alan has led the development and use of large-scale simulation models of various operations of the United Network for Organ Sharing (UNOS). In particular, the UNOS Liver Allocation Model (ULAM) has been used to compare proposed policies for allocating donated livers to patients awaiting a transplant. This work included state-of-the-art modeling and statistical analysis techniques, resulting in a number of archival publications. But partially on the basis of Alan's extensive analyses of ULAM-generated predictions of the effects of implementing various policies, UNOS made a highly publicized change to its liver-allocation policy in January 1997. In June 1998, Alan testified to Congress on the results of his comparison of the current policy vs. a sickest-patient-first national waiting list; shortly thereafter, Congress authorized the continuation of the current policy for a year pending and independent review by the National Academy of Sciences. This is a remarkable example of the definitive practice of simulation in addressing ultimate questions of life and death.

Many of us would not be here today if it were not for Alan. Just look at this small sampling of the lives he has touched. On the academic side of things, for instance, Bruce Schmeiser might never have decided to go to Purdue if Alan had not been doing simulation there. Jim Wilson would probably have ended up in a different field than simulation. Lee Schruben and David Kelton have told me that they might not have been where they are today without the foundations laid down by Alan. And then additional generations would never have been spawned: Barry Nelson, Keebom Kang, Enver Yucesan; the list goes on and on. On the applied side, Alan was doing things with simulation 25 years ago that have ultimately evolved into the bountiful variety of simulation languages that we see today. His ideas have certainly influenced generations of simulation language developers and modelers.

Clearly, in all ways, Alan has advanced the status of our field, so let's congratulate my wonderful friend on this outstanding achievement.

Julian Reitman Receives First Lifetime Professional Achievement Award from INFORMS-College on Simulation

Left to right: Stephen D. Roberts and Julian Reitman

The INFORMS College on Simulation is pleased to recognize Julian Reitman with its first Lifetime Professional Achievement Award (LPAA). The award was presented during the opening ceremonies of the 1998 Winter Simulation Conference, recently held in Washington, DC. The Selection Committee consisted of Steve Roberts, David Goldsman, and Gordon Clark. The LPAA award, given at most once a year, was established "to recognize major contributions to the field of simulation that are sustained over most of a professional career." Certainly Julian Reitman epitomizes that ideal. His active career in simulation has covered more than forty years, virtually spanning the history of modern computer simulation.

Julian Reitman was on the frontier of simulation application and he pioneered many simulation developments. And he has generally been regarded as one of the "true" founders of the simulation community as we know it.

Almost from the beginning of his career in the late 1940s, Julian was thrust into the world of electronic analog computing and modeling. He was fortunate to make an early transition into the digital world in the 1950s, being asked to create computer and communications systems for airline reservations. This assignment permitted him the opportunity to work directly with complex systems of people and technology.

As with so much of the history of mankind, it is how we handle the confrontation with real problems that is ultimate test of our character. In Julian's case, out of a frustration with limited analysis tools, he "discovered" computer simulation. In fact, it was probably Julian's prodding that caused IBM to make GPSS, its internal simulation language, public. Julian was one of the first, and one of the few, to recognize the value of a "high-level" modeling approach to solving complex systems problems. In the 1960s, he was the leader of one of the first simulation application groups in industry -- at the Norden Division of United Aircraft Corporation.

Throughout the 1960s and into the 1970s, Julian and his team at Norden had a number of remarkable accomplishments. They created many simulation models of real systems: naval vessel performance, anti-submarine warfare, effectiveness of airborne radar, railed automated highways, air traffic control, message switching in communications, yield predication for integrated circuit production, and countless others. Activities were carried out throughout the world. Many of this models were the first such simulation applications and they promoted the tool in a number of ways.

While breaking new ground in simulation applications, Julian became a leading proponent for extensions and enhancements to GPSS that incorporated user features that foretold the future of simulation. Three deserve special mention; (1) memory-management facilities to execute models whose size exceeded physical memory, (2) interactive control of executing simulations with real-time debugging that allowed revision of model logic and data, and (3) animation of executing simulation models and the graphical display of simulation output. Remarkable accomplishments considering that it was 1970!

It would have been easy for Julian to limit his attention to the success of his team and his company, but that is clearly not in his nature. Julian believed that he had an obligation to the profession and to society. In the mid-1960s Julian played a leading role in the establishment of the IEEE Systems, Man, and Cybernetics Group, where he served as chair, was on the administrative committee, was on the Editorial Board of IEEE Press, and an associate editor of two IEEE journals. Julian was named a Senior Life member in recognition of his service to IEEE.

Julian was one of the founders of the Winter Simulation Conference(WSC) first serving as the program chair for the WSC predecessor that was held in 1967. That conference arose out of Julian's concern that simulation applications have an outlet. Julian served as General Chair of the first WSC in 1968, published a proceedings, and established much of the structure and tradition of what we see in today's conference. Julian served in active leadership of the WSC and in 1976 was one of the founding members of the WSC Board, serving until 1985. He has been the longest serving board member representing any society.

Julian was also one of the pioneers in the establishment of the simulation literature. Julian published the first article on simulation to appear in the IEEE general-interest publication in 1974 and numerous articles since then in other journals. He won the best paper award at the Fifth Annual Simulation Symposium in 1972. As an outgrowth of his teaching courses in universities, in plants and locations throughout the world, he ultimately in 1971 wrote one of the first simulation textbooks, destined to be a classic, entitled Computer Simulation Applications: Discrete Event Simulation for Synthesis and Analysis of Complex Systems.

Julian's service to the simulation community continued through the 1980s and into the 1990s. Today he remains active in "retirement" by teaching and documenting the history of science and technology. Julian is quick to remind us all that while there has been considerable advances in the technology of simulation, predictions of performance are often inadequately understood and observed. They are inextricably tied to the human element and that understanding the role of people remains a significant area for future development.

Julian Reitman was among the first, if not the most prominent, to champion of the application of simulation, and this focus on simulation application has been his lifelong passion. Julian's professional contributions to the field of simulation, especially in the application of simulation, are striking not only for their impact on the field, but also for the remarkably long period over which that impact has been sustained.