Ralph Metzner (born May 18, 1936, in Germany) is an American psychologist, writer and researcher, who participated in psychedelic research at Harvard University in the early 1960s with Timothy Leary and Richard Alpert (Ram Dass). Metzner is a psychotherapist, and Professor Emeritus of psychology at the California Institute of Integral Studies in San Francisco, where he was formerly the Academic Dean and Academic Vice-president. Metzner has been involved in consciousness research, including psychedelics, yoga, meditation and shamanism for over 50 years. He is a co-founder and President of the Green Earth Foundation, a non-profit educational organization devoted to healing and harmonizing the relationship between humans and the Earth, and a signatory to the 9/11 Truth Statement.
