Most famous for a late 1920s mystic text titled The Secret Teachings of All Ages, Hall is also known as the founder of a Los Angeles-based non-profit institute known as the Philosophical Research Society.
His earliest spiritually-themed books include The Initiates of the Flame and The Ways of the Lonely Ones (both published in the early 1920s).
Over the course of his seven-decade career as a writer, spiritual leader, and speaker, he gave thousands of lectures and wrote well over a hundred essays and full-length works.
A native of Ontario, Canada, he later settled in Los Angeles, California, U.S.A. His first marriage, to Fay deRavenne, lasted from 1930 until deRavenne's suicide in 1941; his second marriage, to Marie Schweikert Bauer, lasted from 1950 until his death in 1990.
United States President Ronald Reagan reportedly referenced Hall's 1944 work The Secret Destiny of America in some of his political speeches.