Dr. Leo Zeff was an American psychologist and psychotherapist in Oakland, California who pioneered the use of ecstasy (MDMA) and other psychoactive drugs in psychotherapy in the 1970s.
In 1977, when Alexander Shulgin introduced Zeff to MDMA, the drug was still legal. Zeff popularized it in the psychotherapeutic community,[1] dubbing it "Adam" because he believed it returned one to a state of primordial innocence[2].
Leo Zeff was introduced to LSD in 1961 when he was working as a Jungian therapist, and he developed a method for administering LSD to patients during psychotherapy.[3]
Prior to working with psychedelics, Leo Zeff had been a Lieutenant Colonel in the US Army.[3]