In the 1960s, professors Timothy Leary, Ralph Metzner and Richard Alpert (later known as Baba Ram Dass) collaborated on a book titled "", which adapted portions of the "Book of the Dead" as a guide for use in LSD experiences. They hoped to give users of LSD a simulation of death and , to "liberate" them from past problems or mistakes in their lives. Many persons did have positive results from their book. Others pursued it like a , and were not helped or changed for the better.