The Secret Chief Revealed: Conversations with Leo Zeff, pioneer in the underground psychedelic therapy movement

Revised edition with new text and photos

This Book is dedicated to the memory of Leo, with the fervent hope that the revelation of his work will help bring understanding and sanity to a confused world. May it pave the way for others to reap the benefits he worked so hard to establish.

“Though my father enjoyed the occasional recognition that came his way in later years, no accolade or honor ever meant as much to him as a single human being telling him how much his knowledge, wisdom, and willingness to do this work has changed his or her life. He surely left the world – and me – richer for having known him.” — Sarah Zeff

“In the illegality of his time it was unthinkable to publish the excellent results of his therapy. It is therefore praiseworthy that today, years after his death, a friend has undertaken the task of publishing the details of the therapeutic methodology of this intrepid Ph.D. psychologist.” — Albert Hofmann, Ph.D., inventor of LSD

“Jacob (Leo) painfully weighed the pros and cons and made the decision to challenge the law, continue his work with psychedelics, and assume personal responsibility for his activity. He has already passed the judgment of his “family,” the friends and clients whose lives he has profoundly changed. They remember him with great love and gratitude. It remains to be seen how he will be judged by history...” — Stanislav Grof, M.D., author of LSD Psychotherapy