This memoir of an underground psychedelic therapist reveals for the first time the identity of pioneering psychedelic therapist Leo Zeff, which was kept secret in the original The Secret Chief published in 1997. This version contains the same text as the original with new material including epilogues by Leo's children and patients, and an introduction by Myron Stolaroff. The 'Secret Chief' shares his experiences facilitating therapeutic transformations with compassion and skill, offering rare insights into pre-legalization psychedelic healing work.