National Museum of Nuclear Science & History
Ralph E. Telford worked at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Celia Szapka Klemski was working as a secretary for the State Department in Washington, DC when she was transferred to Manhattan to work on the Manhattan Project in 1942.
Hayden Rector was a contract attorney for the U.S. Army Corps of Engineers at Hanford, WA during the Manhattan Project.