National Museum of Nuclear Science & History
Richard Apple was a research associate at the University of Chicago’s Metallurgical Laboratory during the Manhattan Project.
Ennis Peters was a staff worker at Los Alamos during the Manhattan Project.
Fred Johnson worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Arthur Weisberg was a mechanical engineer with the Special Engineer Detachment assigned to the Metallurgical Lab at the University of Chicago.