Alberto Villoldo, PhD, is a medical anthropologist and psychologist who has studied the spiritual practices of the Amazon and the Andes for more than 25 years. While at San Francisco State University, he founded the Biological Self-Regulation Laboratory to study how the mind creates psychosomatic health and disease. Dr. Villoldo is founder of The Four Winds Society, through which he teaches individuals throughout the world the practice of energy medicine. He has written numerous best-selling books, including Power Up Your Brain: The Neuroscience of Enlightenment (with Dr. David Perlmutter); Shaman, Healer, Sage; and The Four Insights.