Claudio Naranjo, M.D., is the author of Character & Neurosis, Ennea-Type Structures, and The One Quest. He has taught comparative religion at the California Institute of Asian Studies, human psychology at the University of California at Santa Cruz, and meditation at Nyingma Institute of Berkeley, California. He was also the founder of SAT Institute, an integrative psycho-spiritual school, now headquartered in Spain. He lives in Berkeley, California.