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