National Museum of Nuclear Science & History
J. O'Conner worked for the Midwest Piping and Supply Company.
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.
William Schafer was a staff worker at Los Alamos during the Manhattan Project.
