Venerable Gyatrul Rinpoche was born in 1924 in China near the Tibetan border. At the age of seven he was recognized to be a reincarnate tulku and trained at Payul Dhomang Monastery in eastern Tibet. Rinpoche spent many years in solitary retreat before fleeing the Communist invasion of Tibet in 1959. After living in India for twelve years, Rinpoche moved to America and in 1976 was appointed as H.H. Dudjom Rinpoche's spiritual representative in America. Rinpoche has founded many Buddhist centers, including Tashi Choling in Oregon, Orgyen Dorje Den in the San Francisco Bay area, Norbu Ling in Texas, Namdroling in Montana, and a center in Ensenada, Mexico. B. Alan Wallace is president of the Santa Barbara Institute for Consciousness Studies. He trained for many years as a monk in Buddhist monasteries in India and Switzerland. He has taught Buddhist theory and practice in Europe and America since 1976 and has served as interpreter for numerous Tibetan scholars and contemplatives, including H. H. the Dalai Lama. After graduating summa cum laude from Amherst College, where he studied physics and the philosophy of science, he earned his MA and PhD in religious studies at Stanford University. He has edited, translated, authored, and contributed to more than thirty books on Tibetan Buddhism, medicine, language, and culture, and the interface between science and religion.