Richard Phillips Feynman (May 11, 1918 - February 15, 1988) was an American theoretical physicist, known for his work in the path integral formulation of quantum mechanics, the theory of quantum electrodynamics, and the physics of the superfluidity of supercooled liquid helium. In 1965, Feynman received the Nobel Prize in Physics jointly with Julian Schwinger and Shin'ichirō Tomonaga.