BARRY SHANE, Ph.D., is a professor of nutrition and chair of the Department of Nutritional Sciences at the University of California at Berkeley. He was born and educated in England and received his Ph.D. in biochemistry at the University of London. This was followed by postdoctoral studies at the University of California at Berkeley and a faculty position at the Johns Hopkins University. Dr. Shane’s research is focused on various areas of biochemical nutrition, including the metabolic role and interrelationships of water-soluble vitamins and the influence of genetic variation on vitamin requirements. He has authored over 100 peer-reviewed articles. He is on the editorial board of the American Journal of Clinical Nutrition, Journal of Biological Chemistry and Journal of Nutritional Biochemistry and was awarded the Mead Johnson Award by the American Society of Nutrition Sciences. He currently serves on the board of the Federation of American Societies for Experimental Biology.

STEVEN H.ZEISEL, M.D., Ph.D., is professor and chair in the Department of Nutrition and professor in the Department of Pediatrics at the University of North Carolina at Chapel Hill. He received his medical degree from Harvard University and his Ph.D. in nutrition from the Massachusetts Institute of Technology. Dr. Zeisel is the author of a medical curriculum in nutrition that is being used at more than 100 medical schools. Dr. Zeisel’s research focuses on nutrient metabolism, specifically that of choline, with special emphasis on establishing human nutrient requirements and on identifying cancer-causing agents that are produced within the human body. He has authored more than 140 peer-reviewed publications and book chapters. Dr. Zeisel currently serves on the Medical Education Committee of the American Society for Clinical Nutrition and on the board of directors of the Association of Departments and Programs of Nutrition. Dr. Zeisel also is the editor-in-chief of the Journal of Nutritional Biochemistry.

IRWIN H.ROSENBERG, M.D., (Liaison, Subcommittee on Upper Levels), is an internationally recognized leader in nutrition science who has made important and unique contributions to the understanding of nutrition metabolism in health and disease. Dr. Rosenberg is professor of physiology, medicine, and nutrition at Tufts University School of Medicine and School of Nutrition; director of the Jean Mayer U.S. Department of Agriculture (USDA) Human Nutrition Research Center on Aging at Tufts University; and dean for nutrition sciences at Tufts University. As a clinical nutrition investigator he has helped develop a nutritional focus within the