Following some brief involvement with Marxism in 1939, Parsons converted to Thelema, the new religious movement founded by the English occultist Aleister Crowley.

citation

Wikipedia contributors. (2024, January 17). Jack Parsons. In Wikipedia, The Free Encyclopedia. Retrieved January 24, 2024, from https://en.wikipedia.org/w/index.php?title=Jack_Parsons&oldid=1196573922

Jack Parsons (Wikipedia) John Whiteside Parsons (born Marvel Whiteside Parsons; October 2, 1914 – June 17, 1952) was an American rocket engineer, chemist, and Thelemite occultist. Associated with the California Institute of Technology (Caltech), Parsons was one of the principal founders of both the Jet Propulsion Laboratory (JPL) and the Aerojet Engineering Corporation. He invented the first rocket engine to use a castable, composite rocket propellant, and pioneered the advancement of both liquid-fuel and solid-fuel rockets.