Ralph Metzner Ph.D. (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 (later named Ram Dass). Dr. 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.

Dr. Metzner has been involved in consciousness research, including psychedelics, Yoga, meditation and Shamanism for over 45 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 . Metzner was featured in the 2006 film Entheogen: Awakening the Divine Within, a documentary about rediscovering an enchanted cosmos in the modern world.

He has conducted numerous workshops on consciousness transformation and alchemical divination, both nationally and internationally . He is also a poet and singer-songwriter and has produced one CD.

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