National Museum of Nuclear Science & History
Frederick Roach served in the Army at Los Alamos during the Manhattan Project.
Wilam Spangler was a staff worker at Los Alamos during the Manhattan Project.
Charles Critchfield (1910-1994) was an American mathematical physicist. In December 1942, he was approached by J.
Robert C. Hirt was a research assistant at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
