Edward F. Kelly is a research professor in the Department of Psychiatry and Neurobehavioral Sciences at the University of Virginia, with interests in psychical research and functional neuroimaging. He is lead author of three previous books: Computer Recognition of English Word Senses; Altered States of Consciousness and Psi: An Historical Survey and Research Prospectus; and Irreducible Mind: Toward a Psychology for the 21st Century. Adam Crabtree is a psychotherapist in private practice and on the faculty of the Centre for Training in Psychotherapy in Toronto, with interests in the history of animal magnetism and hypnotism, as well as the history and practice of psychodynamic psychology. He is author of six books including From Mesmer to Freud: Magnetic Sleep and the Root of Psychological Healing; Multiple Man; and Memoir of a Trance Therapist. Paul Marshall is an independent researcher with interests in mysticism, philosophy and psychology of religion, science-religion relations, and consciousness studies. He is author of two previous books, The Living Mirror: Images of Reality in Science and Mysticism; and Mystical Encounters with the Natural World: Experiences and Explanations.