National Museum of Nuclear Science & History
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.
Piper worked for Stone and Webster Engineering Corporation.
Block worked in the United States Engineer District Office.
John Otto worked for Clinton Laboratories at the X-10 Reactor.
