National Museum of Nuclear Science & History
E. T. O'Conner worked for the Roane-Anderson Company.
Gentry worked in the United States Engineer District Office.
Ambroso Hoelscher was a laboratory assistant at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Alfred Pfanstiehl was a junior physicist at the Chicago Met Lab during the Manhattan Project. Pfanstiehl was a signatory of the Szilard Petition, an attempt to avert military use of the atomic bomb against Japan.
Harry worked at Los Alamos during the Manhattan Project.
