Andrew Weil, M.D. has worked for the National Institute of Mental Health and for fifteen years was a Research Associate in Ethnopharmacology at the Harvard Botanical Museum. He has traveled extensively throughout the world collecting information about the medicinal properties of plants, altered states of consciousness, and healing. He has written for the New York Times Magazine, The New Yorker, Nature, The New England Journal of Medicine, and other national publications. He is under constant demand to lecture and appear on radio and television. He is currently Associate Director of the Division of Social Perspectives in Medicine, and Director of the Program in Integrative Medicine at the University of Arizona in Tucson, where he practices natural and preventive medicine.