Leo Zeff (1912 – 1988) was a pioneering psychedelic therapist and researcher focused on LSD, MDMA and other psychoactive drugs. He conducted much of his work and practice underground after psychedelics were declared illegal in the 1960s. By the time he turned 70, Zeff was single-handedly responsible for the introduction of psychedelic compounds in use globally among nearly 4,000 individual therapists/practitioners
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