Sylvan Muldoon (February 18, 1903 – October 15, 1969) was an American esotericist who promoted the concept of astral projection. According to Muldoon, astral projection is an out-of-body experience (OBE) that assumes the existence of an astral body separate from the physical body and is capable of travelling outside it. A 2012 Princeton University Press publication by Hugh Urban asserted that one of Muldoon's most popular books formed the basis for theories of the Church of Scientology founder L…