E. Virgil Neal’s career started out with writing successful textbooks, but then took a turn into being a stage hypnotist and then a series of dicey mail-order businesses.
Research:

Behind the Scenes Minis: Piece of Work
17:48

E. Virgil Neal: Hypnotist, Fraudster, Tycoon, Part 2
41:22

SYMHC Classics: Mancini Sisters
42:22