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Ralph Metzner (1936-2019) obtained his Ph.D. in Clinical Psychology at Harvard University, where he collaborated with Timothy Leary and Richard Alpert on psychedelic research. He was Professor Emeritus at the California Institute of Integral Studies in San Francisco, President and co-founder of the Green Earth Foundation, and a psychotherapist in private practice. Dr. Metzner is the author of numerous books, including Searching for the Philosophers' Stone and Sacred Mushroom of Visions.
