Manly P. Hall (1901-1990) founded the Philosophical Research Society, an organization dedicated to the dissemination of practical knowledge in a variety of philosophical fields. He is best known for his 1928 classic, The Secret Teachings of All Ages.
Manly P. Hall was a noted Canadian author and mystic. He is most famous for 'The Secret Teaching of All Ages', It is a marvelous collection of writings on ancient mysteries, secret societies, alchemy, and more.