Aleister Crowley (1875-1947), also known as "The Great Beast" and the "Wickedest Man in the World" was one of the most profound students of Magick, Qabalah and Yoga. His vast influence reaches through all modern occultism. He is widely recognised as the first Western investigator to give initiation a truly scientific method. In reconciling occultism to physical science, mathematics and philosophy, Crowley achieved a lasting synthesis that remains unsurpassed for depth of insight and comprehensiveness. J. Daniel Gunther has long been identified with the work of A.. A.. He is a well-known international teacher and lecturer on Aleister Crowley and the Great Work. He is the author of the Inward Journey series including: Initiation in the Aeon of the Child and The Angel and the Abyss; and the creator of a volume of alchemical drawings, Opus Alchymicum. He has also contributed to many other works in the esoteric field. James Wasserman, a longtime Thelemite and member of O.T.O., is the author of In the Center of the Fire: A Memoir of the Occult. He edited and introduced Aleister Crowley and the Practice of the Magical Diary; and is the co-author of To Perfect This Feast: A Performance Commentary on the Gnostic Mass. He is responsible for restoring The Egyptian Book of the Dead, The Book of Going Forth by Day. Israel Regardie (1907-1985) was an Adept of the Golden Dawn and he was one of the greatest exponents of the Western Esoteric Tradition of the 20th century. He was also an initiate of Aleister Crowley's Order of the A.A., and he was a IXth degree initiate of Crowley's O.T.O. It was his aim to preserve the teachings and work of the Golden Dawn and Aleister Crowley. His success in this task has profoundly influenced occult thought. From the age of 20, Regardie worked as Crowley's personal secretary. During this period, until their bitter parting, Regardie was one of the few who knew Crowley well. He was one of the few who were qualified to provide first-hand, personal insight into the character and personality of one of the major figures in Western Magick. In addition to his extensive writings, Regardie practiced as a chiropractor and as a neo-Reichian therapist. He taught Psychiatry at the Los Angeles College of Chiropractic and contributed articles to many Psychology magazines.