After coordinating efforts with Hereward Carrington, the famous American investigator of the unknown, the two published the sensational, jointly authored book The Projection of the Astral Body in 1929. The authors published two other books: The Case for Astral Projection (1936) and The Phenomena of Astral Projection (1951). Despite a large serving of esotericism, Muldoon’s books, (especially the first one) contain a lot of helpful, practical information and explanation of the most diverse phenomena that can occur during the phase. However, Muldoon is considered to be the greatest popularizer of irrational esoteric terms and theories, which subsequently became quite widespread. Sylvan Muldoon passed away in 1971. CHARLES LEADBEATER Charles Leadbeater was born in England in 1847 (1854 according to some sources). After dropping out of Oxford due to hard times, Leadbeater became an ordained priest, but then became quite active in the occult. This led to his becoming a member of the Theosophical Society in 1883. Leadbeater became one of its most famous participants. The combination of a bright mind, scientific knowledge, and interest in the paranormal led him to publish many books on many diverse topics. One of them, Dreams: What They Are and How They Are Caused (1898), was one of the first works to touch upon the phenomenon of the phase. Leadbeater’s writing is saddled with a ton of esoteric terms and theories. In it, the term astral plane is predominantly used for the phase. Nevertheless, the book is not without some helpful guidelines concerning techniques. Charles Leadbeater passed away in 1934.