Charles T. Tart, PhD, is emeritus professor of psychology at the University of California, Davis. He is a past-president of the Parapsychological Association. He has published over 100 scientific papers in parapsychology. He is editor of several anthologies including Altered States of Consciousness, Transpersonal Psychologies, Mind at Large, and Body Mind Spirit: Exploring the Parapsychology of Spirituality. Books that he has authored include Psi: Scientific Studies in the Psychic Realm, States of Consciousness, The End of Materialism, Learning to Use Extrasensory Perception, On Being Stoned, Waking Up: Overcoming the Obstacles to Human Potential, and Open Mind – Discriminating Mind.