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          6. Henry Stimson

          As Secretary of War under Presidents Franklin D. Roosevelt and Harry Truman, Henry L. Stimson (1867-1950) oversaw the entire Manhattan Project, and was responsible for appointing key project leaders and authorizing project construction sites across the US.

          By the time Stimson became Secretary of War under Roosevelt, scientific processes behind the atomic bomb had been researched for nearly a decade, but no formal proposals suggesting a US organization to research and construct a nuclear weapon had yet been made.

          In 1941, President Roosevelt appointed Stimson, along with Vice President Henry Wallace, Army Chief of Staff George Marshall, and scientists Vannevar Bush and James B. Conant to a Top Policy Group dedicated to exploring nuclear technology and policy.

          As the potential strength and importance of nuclear weapons grew clearer, the Top Policy Group evolved into a separate entity dedicated to producing the atomic bomb–the Ma