William E. Tewes

T. W. Brown

Allen Ridley

Ridley worked at the 300 Area at Hanford during the Manhattan Project.

Wallace Margelofsky

Harry Truman

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.