John_R._Dunning--Hans_Albrecht_Bethe

John Ray Dunning (September 24, 1907 – August 25, 1975) was an American physicist who played key roles in the Manhattan Project that developed the first atomic bombs. He specialized in neutron physics, and did pioneering work in gaseous diffusion for isotope separation. He was dean of the school of engineering and applied science at Columbia University from 1950 to 1969.