Allen H. Greenfield also known by his ecclesiastical name Tau Sir Hasirim, is an American occultist, ceremonial magician, UFOlogist, writer, editor, and Gnostic Bishop of Ecclesia Gnostica Universalis who resides in Atlanta, Georgia. His book The Story of the Hermetic Brotherhood of Light is one of the few sources of information on this subject. His book The Compleat Rite of Memphis is a comprehensive history of an Egyptian Rite of Freemasonry, and he edited an authorized, annotated edition of the work Liber Thirty-One by Charles Stansfeld Jones. He was elected and consecrated a Bishop by the Holy Synod of the Neopythagorean Gnostic Church in 1986. In 1987 he was extended recognition as a Bishop within the Gnostic Catholic Church - Ordo Templi Orientis (OTO) and was consecrated in New York in November 1988. His episcopal title "Tau" is sometimes abbreviated as "T" and prefixed to his legal name, and thus he may also be referred to as T Allen Greenfield. A former editor of the OTO journal LAShTAL, Greenfield has more recently become a critic of the Order's upper management. In February 2006, he called for their resignation and stepped down from all managerial duties in protest, issuing a strong criticism of the current Outer Head of the Order, William Breeze. A past (elected) member of the Society for Psychical Research and the National Investigations Committee on Aerial Phenomena (from 1960), he has twice been the recipient of the "UFOlogist of the Year Award" of the National UFO Conference (1972 and 1992). He is a Borderland Science Research Associate (BSRA), and has conducted on-site UFO and alien abduction investigations in Brooksville, FL, Pascagoula, MS and Brown Mountain, NC. His book Secret Cipher of the UFOnauts was reviewed by Robert Anton Wilson in his book Everything is Under Control. This review discusses how Greenfield builds on the principles established in Carl Jung's 1952 book, Flying Saucers: A Modern Myth of Things Seen in the Sky. He is also a past President of the Atlanta Science Fiction Organization (ASFOII), and the editor of the periodical The Paraufologist.