From Wikipedia: "Sylvan Muldoon was an American pioneer in the field of astral projection that is described as of 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. Ron Hubbard which he claimed were his own. Of the five books published by Muldoon, three are considered classics."
