Norris Edwin Bradbury (30 May 1909 – 20 August 1997), was an American physicist. He served as Director of the Los Alamos National Laboratory for 25 years from 1945 to 1970. He replaced Robert Oppenheimer. Bradbury worked with Oppenheimer on the Manhattan Project during World War II. Bradbury was in charge of the final assembly of "the Gadget", detonated in July 1945 for the Trinity test.