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Stafford Leak Warren (July 19, 1896 - July 26, 1981) was an American physician and ... He was responsible for the health and safety of the thousands of personnel ... The medical school had opened in 1925 and did not graduate its first class ... BrigadierGeneral Leslie R. Groves, the director of the Manhattan Project 
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It was an director of an Manhattan project.

His name was "Brigadier General Leslie R."

He was the one who graduated from MIT and responsible for "The Fat Man"