Some say he was a breakthrough academic and visionary shaman. Others say he was a sham. Either way, Carlos Castaneda shaped a generation of mystical thinkers and magic mushroom eaters. In 1968, at the height of the psychedelic age, Castaneda published The Teachings of Don Juan: A Yaqui Way of Knowledge, the first of twelve books describing his apprenticeship to an Indian shaman, and his journeys to the "separate reality" of the...