The Wikipedia article of the day for October 30, 2016 is Jack Parsons (rocket engineer).
Jack Parsons (1914–1952) 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. He invented the first rocket engine using a castable composite rocket propellant, and helped develop both liquid-fuel and solid-fuel rockets. Inspired by science fiction literature, he developed an interest in rocketry in his childhood and in 1928 began amateur rocket experiments with school friend Ed Forman. In 1934 he united with Forman and graduate student Frank Malina to form the Caltech-affiliated GALCIT Rocket Research Group, supported by Guggenheim Aeronautical Laboratory chairman Theodore von Kármán. After working on Jet-Assisted Take Off for the U.S. military, the GALCIT Group became JPL in 1943. For his contributions to rocket engineering, his advocacy of space exploration and human spaceflight, and his role in the founding of JPL and Aerojet, Parsons is regarded as one of the most important early figures of the U.S. space program.