Ralph Metzner, PhD is a recognized pioneer in psychological, philosophical, and cross-cultural studies of consciousness and its transformations. He collaborated with Timothy Leary and Richard Alpert in classic studies of psychedelics at Harvard University in the 1960s, co-authored The Psychedelic Experience and was editor of The Psychedelic Review. He is a psychotherapist and Professor Emeritus at the California Institute of Integral Studies (CIIS), where he was also the Academic Dean for 10 years in the 1980s. His books include The Unfolding Self, The Well of Remembrance, Green Psychology, The Expansion of Consciousness, Alchemical Divination, and Mind Space and Time Stream. He is the editor of two collections of essays on the pharmacology, anthropology, and phenomenology of ayahuasca and psilocybin mushrooms. He is President and Founder of the Green Earth Foundation, dedicated to healing and harmonizing the relations between humanity and the Earth (greenearthfound.org).