Oren M. Becker is an Assistant Professor at Tel Aviv University, Israel. The author or coauthor of numerous publications, he is the recipient of the Rothschild Postdoctoral Fellowship (1991), the Fulbright Postdoctoral Fellowship (1991), and the Yig'al Alon Fellowship for Outstanding Young Scientists (1994), and a member of the Israel Chemical Society. Professor Becker received the B.A. degree (1987) in philosophy, the B.Sc. degree (1987) in chemistry and physics, and the Ph.D. degree (1991) in theoretical chemistry from the Hebrew University of Jerusalem, Israel. Alexander D. MacKerell, JR. is an Associate Professor at the School of Pharmacy, University of Maryland, Baltimore. The author or coauthor of numerous publications, he is a member of the Federation of American Societies for Experimental Biology, the American Chemical Society, and the International Society of Quantum Biology and Pharmacology, among others. Professor MacKerell received the A.S. degree (1979) in biology from Gloucester County College, Sewell, New Jersey, the B.S. degree (1981) in chemistry from the University of Hawaii, Honolulu, and the Ph.D. degree (1985) from Rutgers University, New Brunswick, New Jersey. Additionally, he was a Postdoctoral Fellow at the Karolinska Institut, Stockholm, Sweden, and at Harvard University, Cambridge, Massachusetts. Benoit Roux is Professor of Biochemistry and Structural Biology at the Weill Medical College of Cornell University, New York, New York. The author or coauthor of over 70 book chapters and publications, he is the recipient of the Noranda Lecture Award of the Canadian Society for Chemistry (1998) and the Rutherford Medical (1998) from the Royal Society of Canada. Professor Roux received the B.Sc. degree (1981) in physics and the M.Sc. degree (1984) in biophysics from the University of Montreal, Canada, and the Ph.D. degree (1990) in biophysics from Harvard University, Cambridge, Massachusetts. Masakatsu Watanbe is a Scientific Developer at Wavefunction, Inc., Irvine, California. The author of numerous publications, he is a member of the American Physical Society, the American Chemical Society, and the IEEE Computer Society. The recipient of the Harvard Postdoctoral Fellowship (1991) and the Soka Gakkai International Academic and Cultural Contribution Award (1993), Dr. Watanabe received the B.A. degree (1986) in chemistry from West Virginia University, Morgantown, and the Ph.D. degree (1991) in chemistry from the University of Pennsylvania, Philadelphia.