Andrew Weil, M.D. is the author of ten previous books, including Spontaneous Healing, Eight Weeks to Optimum Health, Eating Well for Optimum Health, and, with Rosie Daley, The Healthy Kitchen. A graduate of Harvard Medical School, he is clinical professor of medicine and director of the Program in Integrative Medicine at the University of Arizona. He writes Self Healing, a monthly newsletter, and maintains the Web site DrWeil.com. More of his work on aging can be found at www.healthyaging.com. He lives in Arizona.