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National Museum of Nuclear Science & History

J. Samuel (“Sam”) Walker is the former historian of the U.S. Nuclear Regulatory Commission and the author of Prompt and Utter Destruction: Truman and the Use of Atomic Bombs against Japan. He is also the author of five books on the history of regulating nuclear power, including Three Mile Island: A Nuclear Crisis in Historical Perspective and The Road to Yucca Mountain: The Development of Radioactive Waste Policy in the United States.

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Harry Truman

Washington, DC

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.

Eugene Reybold

Washington, DC

Eugene Reybold (1884-1961) was a Lieutenant General and Chief of Engineers in the US Army. He was involved in the early stages of the Manhattan Project.

Aage Niels Bohr

Los Alamos, NM

Aage Niels Bohr (1922-2009) was a Danish nuclear physicist and winner of the 1975 Nobel Prize in Physics.

Hyman G. Rickover

Washington, DC

Hyman George Rickover was a Navy admiral who served during World War II who is known as the “Father of the Nuclear Navy” due to his role in developing the first nuclear-powered submarine.