Ralph Metzner (1936-2019) was a Ph.D. recipient. He earned his Ph.D. in Clinical Psychology from Harvard University, where he worked on psychedelic research alongside Timothy Leary and Richard Alpert. He was a psychotherapist in private practice and a professor emeritus at the California Institute of Integral Studies in San Francisco. He was also the President and co-founder of the Green Earth Foundation. Dr. Metzner is the author of several publications, including Sacred Mushroom of Visions and Looking for the Philosophers' Stone.
- The Psychedelic Experience: A Manual Based on the Tibetan Book of the Dead
- Consciousness Medicine: Indigenous Wisdom, Entheogens, and Expanded States of Consciousness for Healing and Growth
- ALLIES for AWAKENING Guidelines for productive and safe experiences with entheogens
- The Toad and the Jaguar a Field Report of Underground Research on a Visionary Medicine: Bufo Alvarius and 5-Methoxy-Dimethyltryptamine
- Ecology of Consciousness: The Alchemy of Personal, Collective, and Planetary Transformation