Alberto Villoldo, Ph. D., has trained as a psychologist and medical anthropologist, and has practiced yoga formore than 25 years. He has traveled to the source of India's holy rivers in the Himalayas to rediscover the wisdomof the Sadhu, India's ancient shamans. Dr. Villoldo directs The Four Winds Society, where he trains individualsin the U.S. and Europe in the practice of shamanic energy medicine. He has written numerous best- sellingbooks, including One Spirit Medicine; Shaman, Healer, Sage; and Power Up Your Brain. www.thefourwinds.com