Thomas Cowan, MD, has studied and written about many subjects in medicine, including nutrition, homeopathy, anthroposophical medicine, and herbal medicine. He is the author of Cancer and the New Biology of Water; Vaccines, Autoimmunity, and the Changing Nature of Childhood Illness; and Human Heart, Cosmic Heart; principal author of The Fourfold Path to Healing; and coauthor (with Sally Fallon) of The Nourishing Traditions Book of Baby and Child Care. Dr. Cowan has served as vice president of the Physicians' Association for Anthroposophic Medicine and is a founding board member of the Weston A. Price Foundation. He also writes the Ask the Doctor column in Wise Traditions in Food, Farming, and the Healing Arts (the Weston A. Price Foundation's quarterly magazine), has lectured throughout the United States and Canada, and is the cofounder of two family businesses, Dr. Cowan's Garden (drcowansgarden.com) and Human Heart, Cosmic Heart (humanheartcosmicheart.com). He has three grown children and currently resides in San Francisco with his wife, Lynda Smith.