National Museum of Nuclear Science & History
John Nicklin worked for the United States Engineer District Office.
Maskewitz worked with calutrons at the Y-12 plant at Oak Ridge during the Manhattan Project.
Gertrude Mitchell worked for the Roane-Anderson Company.
Harry S. Truman (1884-1972) was the 33rd President of the United States of America. Truman first learned of the Manhattan Project after the death of President Roosevelt in April of 1945, when he relinquished his role as Vice President and took the oath of office as the next president of the United States.
