German-American psychologist who was Timothy Leary's colleague at Harvard — co-writing The Psychedelic Experience with Leary and Alpert — and who went on to explore consciousness transformation, shamanism, and ecological spirituality, founding the Green Earth Foundation.
Developed the most intellectually rigorous framework for understanding consciousness transformation across traditions — Maps of Consciousness traced the alchemical, astrological, Sufi, and Tantric models of psychological transformation as maps of the same territory that psychedelic research was exploring — providing the comparative framework for transpersonal psychology.
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