Satan: His Psychotherapy and Cure by the Unfortunate Dr. Kassler, J.S.P.S. (ISBN 978-0595145065) is a 496-page book written in 1982 by Jeremy Leven. The book focuses around the central character, Dr. Kassler, a somewhat disheveled psychiatrist with many personal problems. Kassler is commissioned by the Dark Prince himself to administer psychotherapy. Satan is convinced that being the opponent of God is hard work and that he really just needs someone to listen to his tragic story. In return, he offers Kassler the answer every human seeks: what happens to us after death? Source: Wikipedia (en)