Under The Sun
Nobel laureate and popularizer of physics.
Richard Feynman is one of the best known physicists of the mid-20th century. His contributions to the science are numerous, and include both quantum electrodynamics and the parton model of particle physics. Feynman also participated in the Manhattan Project (where he worked with and broke into the desk of Edward Teller) and the Challenger investigation. Feynman authored a number of popular works, including Six Easy Pieces and Six Not So Easy Pieces. Feynman was one of the winners of the Nobel Prize in Physics in 1965.
The PCs met him while he was on guard duty at the Gate of Worlds in the Astral Sea. Probably.
More information here.