Stéphane Ethier Princeton Plasma Physics Laboratory (PPPL), P.O. Box 451, Princeton, New Jersey 08543 (ethierpppl.gov). Dr. Ethier is a computational physicist in the Computational Plasma Physics Group at PPPL. He received a Ph.D. degree from the Department of Energy and Materials of the Institut National de la Recherche Scientifique in Montreal, Canada. His current research involves high-performance computing and large-scale gyrokinetic particle-in-cell simulations of microturbulence in magnetic confinement fusion devices.

William M. Tang Princeton Plasma Physics Laboratory (PPPL), P.O. Box 451, Princeton, New Jersey 08543 (tangpppl.gov). Professor Tang is Chief Scientist at PPPL and Associate Director of the Princeton Institute of Computational Science & Engineering at Princeton University. After receiving his Ph.D. degree in physics from the University of California, Davis, in 1972, he advanced to the Principal Research Physicist rank at PPPL and Lecturer with rank of Professor in the Department of Astrophysical Sciences by 1979. He also became a Fellow of the American Physical Society at that time. From 1992 through 2004, he served as head of the PPPL Theory Department, generally recognized as the premier plasma science theory department in the world. He is currently the Director of the Plasma Science Advanced Computing Institute for the Fusion Energy Sciences Program of the Department of Energy. With respect to his research activities, he is internationally recognized for his leading role in the development of the requisite kinetic formalism as well as the associated computational applications dealing with electromagnetic plasma behavior in complex geometries.

Robert Walkup IBM Research Division, Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 (walkupus.ibm.com). Dr. Walkup is a Research Staff Member at the IBM Thomas J. Watson Research Center. He received his Ph.D. degree in physics from the Massachusetts Institute of Technology. He currently works on high-performance computing algorithms.

Leonid Oliker Lawrence Berkeley National Laboratory (LBNL), 1 Cyclotron Road, Berkeley, California 94720 (olikerlbl.gov). Dr. Oliker is a Computer Staff Scientist in the Future Technologies Group of the Computational Research Division at LBNL. He received his Ph.D. degree in computer Science from the University of Colorado, Boulder. His research interests involve optimization of irregular algorithms on advanced parallel systems, performance evaluation of scientific computations on emerging architectures, and job superscheduling in heterogeneous grid environments.