Peter A. Boyle School of Physics, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, Scotland, UK (pab@physics.columbia.edu). Dr. Boyle received his Ph.D. degree in lattice field theory from the University of Edinburgh. He has been researching lattice quantum chromodynamics (QCD) since 1994, and has used a variety of massively parallel processor (MPP), cluster, and vector high-performance computing platforms. Dr. Boyle is the author of the cross-platform domain-specific compiler for high-performance QCD assembler kernels; he has spent the last four years working on testing, operating systems, and hardware debug on the QCDOC project at Columbia University.

Dong Chen IBM Research Division, Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 (chendong@us.ibm.com). Dr. Chen is a Research Staff Member in the Exploratory Server Systems Department. He received his B.S. degree in physics from Peking University in 1990, and M.A., M.Phil., and Ph.D. degrees in theoretical physics from Columbia University in 1991, 1992, and 1996, respectively. He continued as a postdoctoral researcher at the Massachusetts Institute of Technology from 1996 to 1998. In 1999 he joined the IBM Server Group, where he worked on optimizing applications for IBM RS/6000* SP* systems. In 2000 he moved to the IBM Thomas J. Watson Research Center, where he has been working on many areas of the Blue Gene/L supercomputer and collaborating on the QCDOC project. Dr. Chen is an author or coauthor of more than 30 technical journal papers.

Norman H. Christ Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027 (nhc@phys.columbia.edu). Professor Christ received a B.A. degree and a Ph.D. degree in physics from Columbia University in 1965 and 1966, respectively. He is currently a Professor of Physics at Columbia University. His major focus of research is the study of nonperturbative phenomena in quantum chromodynamics (QCD), addressing frontier questions in particle and nuclear physics. His research is performed using powerful, custom-built massively parallel computers and the techniques of lattice gauge theory. Professor Christ has played a leading role in the design and construction of some of the most powerful QCD-targeted computers since the early 1980s.

Michael A. Clark School of Physics, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, Scotland, UK (mike@ph.ed.ac.uk). Mr. Clark is a graduate student in the School of Physics at the University of Edinburgh. He received his M.S. degree in physics from the University of Edinburgh in 2001. He was involved in the development of the QCDOC supercomputer at Columbia University in 2003 and 2004.

Saul D. Cohen Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027 (sdcohen@phys.columbia.edu). Mr. Cohen graduated from the University of Maryland at College Park in 2001 with degrees in physics, astronomy, mathematics, and computer science. He is currently pursuing a Ph.D. degree in physics at Columbia University with the Lattice Gauge Theory Group.

Calin Cristian Citigroup Quantitative Equity Trading, US Equity Derivatives, 390 Greenwich Street, 3rd Floor, New York, New York 10013 (calin.cristian@citigroup.com). Dr. Cristian is a Quantitative Analyst in the Quantitative Equity Trading Group at Citigroup. He received his B.S. degree in physics from the University of Bucharest in 1996, his M.S. degree from Boston University in 1998, and his Ph.D. degree from Columbia University in 2002. Dr. Cristian joined Citigroup in 2003.

Zhihua Dong Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027 (dong@phys.columbia.edu). Dr. Dong is currently a Research Staff Member at Columbia University. He received his Ph.D. from Columbia in 1993, and since 1999 has been involved in system administration for the front-end host computers for QCD on digital signal processors (QCDSP). Dr. Dong has participated in the development of the QCDOC supercomputer since 2000.

Alan Gara IBM Research Division, Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 (alangara@us.ibm.com). Dr. Gara is a Research Staff Member at the IBM Thomas J. Watson Research Center. He received his Ph.D. degree in physics from the University of Wisconsin at Madison in 1986. In 1998 Dr. Gara received the Gordon Bell Award for the QCDSP supercomputer in the most cost-effective category. He is the chief architect of the Blue Gene/L supercomputer. Dr. Gara also led the design and verification of the Blue Gene/L compute ASIC as well as the bring-up of the Blue Gene/L prototype system.

Bálint Joó School of Physics, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, Scotland, UK (bj@ph.ed.ac.uk). Dr. Joó received a first-class honors degree in computer science and physics and a Ph.D. degree in theoretical particle physics, both from the University of Edinburgh, in 1996 and 2000, respectively. He completed postdoctoral research at the University of Kentucky and Columbia University, and is currently at the University of Edinburgh. He has been a member of the Columbia QCDOC design team since mid-2000. Dr. Joó has been actively involved with the U.S. Department of Energy Scientific Discovery through Advanced Computing (SciDAC) software effort, playing a major part in the QDP++ and Chroma software projects since 2002.

Chulwoo Jung Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973 (chulwoo@phys.columbia.edu). Dr. Jung, a native of South Korea, received a Ph.D. degree in physics from Columbia University in 1998. He spent two years as a postdoctoral Research Scientist at the University of Maryland at College Park. Dr. Jung has been a part of the QCDOC collaboration since 2001, when he joined Columbia University and Brookhaven National Laboratory as a Research Staff Member.

Changhoan Kim Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027 (chateau@phys.columbia.edu). Dr. Kim received his B.S. degree in physics from Seoul National University and his Ph.D. degree in theoretical physics from Columbia University in 2004. He has participated in the QCDOC project since 2000.

Ludmila A. Levkova Indiana University, 117 West Swain Hall, Bloomington, Indiana 47401 (llevkova@indiana.edu). Dr. Levkova is a Postdoctoral Fellow at Indiana University. She received an M.S. degree in theoretical physics from Sofia University, Bulgaria, in 1997, and a Ph.D. degree in theoretical physics from Columbia University in 2004. Dr. Levkova was involved with the QCDOC project in 2000 and 2001 during her graduate studies at Columbia University.

Xiaodong Liao UBS Investment Bank, 677 Washington Boulevard, Stamford, Connecticut 06902 (sheldon.liao@ubs.com). Dr. Liao is currently a Research Analyst and Associate Director in the Program Trading Group at UBS Investment Bank. He received his B.S. degree in physics from Fudan University, Shanghai, China, and his Ph.D. degree in physics from Columbia University.

Guofeng Liu Gluon Capital LLC, 377 Broadway, 10th Floor, New York, New York 10013 (gfliu@physics.columbia.edu). Dr. Liu received a B.S. degree in physics from Beijing University in 1997 and a Ph.D. degree in physics from Columbia University in 2003. He was the primary author of the QCDSP parallel file system and was actively involved in the design of the QCDOC ASIC. Dr. Liu is currently the chief architect of Gluon Capital LLC, specializing in computerized automated equity trading.

Robert D. Mawhinney Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027 (rdm@physics.columbia.edu). Professor Mawhinney is an Associate Professor of Physics at Columbia University. He received his B.S degree in physics from the University of South Florida in 1980 and his Ph.D. degree in physics from Harvard University in 1987. He held postdoctoral positions at the University of Pittsburgh and Columbia University, joining the Columbia faculty in 1992. Professor Mawhinney's physics research is focused on the study of QCD using these large parallel computers. He has been involved in the hardware and software design of both QCDSP and QCDOC.

Shigemi Ohta Institute of Particle and Nuclear Studies, The High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan (shigemi.ohta@kek.jp). Dr. Ohta is a member of the Theory Division of the Institute of Particle and Nuclear Studies in the High Energy Accelerator Research Organization (KEK) of Japan. He has been working in numerical lattice QCD since 1985. From 1987 to 1990 he did postdoctoral research under Professor Norman H. Christ at Columbia University. In the early 1990s he was involved with RIKEN and KEK procurements of supercomputers. Dr. Ohta has recently been involved with the 600-Gflops QCDSP computer at the RIKEN–Brookhaven National Laboratory (BNL) Research Center, Japan, and with the development of the QCDOC computer.

Konstantin Petrov Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973 (petrov@bnl.gov). Dr. Petrov received his Ph.D. degree in the field of theoretical and computational particle physics from Bielefeld University, Germany, in 2002. He subsequently joined the QCDOC development team as a Research Associate in the Nuclear Theory Group at the Brookhaven National Laboratory. His research interests include large-scale lattice simulations of finite-temperature quantum chromodynamics. Dr. Petrov is also involved in the U.S Department of Energy SciDAC project for lattice QCD.

Tilo Wettig Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany (tilo.wettig@physik.uni-regensburg.de). Dr. Wettig is a Professor of Physics at the University of Regensburg, Germany. His previous appointments have included the following: Associate Professor at Yale University, Fellow of the RIKEN–BNL Research Center, Japan, and postdoctoral positions in Germany at the Technical University of Munich and the Max-Planck-Institute in Heidelberg. Dr. Wettig received a Ph.D. degree in theoretical physics from Stony Brook University in 1994.

Azusa Yamaguchi Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland, UK (azusa@physics.columbia.edu). Dr. Yamaguchi received her Ph.D. degree from Ochanomizu University, Japan. She subsequently worked as a postdoctoral researcher in the Computer Science Laboratory at the RIKEN Laboratory in Tokyo, and she was a Research Staff Member at the Particle Physics Laboratory at Ochanomizu University. Dr. Yamaguchi joined the QCDOC project at Columbia University as a postdoctoral researcher. She designed the digital logic for the internode communication in the QCDOC ASIC and the low-level link protocol, flow control, and retransmission logic for the QCDOC serial communications unit (SCU). She is currently a Research Fellow with the Particle Physics Theory Group of the University of Glasgow. Dr. Yamaguchi has been awarded a European Union Marie Curie Fellowship to study the nucleon dipole moment using QCDOC.

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