Bush was a distinguished American scientist. As the USA approached war, Bush put forward the policy that the USA should mobilize all scientific resources and he convinced ROOSEVELT to set up the Office of Scientific Research and Development (OSRD) on 28 June 1941 with himself as Director. Through his activities in promoting scientific research. Bush became involved in co-ordinating research into the atomic bomb. Two principles formed the bases of his policy: to delegate supervision of specific research projects to others which left him free to give overall direction, and to keep research channeled into the war effort. He had to ensure smooth relations between civilians and Army personnel, and overcame his own objections to General GROVES’ appointment as Head of the Manhattan Project. He was a gifted scientist and was President of the Carnegie Institute of Washington during the war.