sentences:  Jack Parsons (rocket engineer)
  
  John Whiteside "Jack" Parsons (born Marvel Whiteside Parsons; October 2, 1914 – June 17, 1952) was an American rocket engineer and rocket propulsion researcher, 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.