Mark Hyman, M.D., is the editor in chief of Alternative Therapies in Health and Medicine, the most prestigious journal in the field of integrative medicine. After ten years as co-medical director at Canyon Ranch in the Berkshires, he is now in private practice in Lenox, Massachusetts. He is the coauthor of the New York Times bestseller Ultraprevention. His websites are www.drhyman.com and www.ultrametabolism.com.