John J. Murphy

R. K. Chalfant

Joseph Kouba

Joseph Kouba was a janitor at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Hugo Leckelt

Hugo Leckelt was a laborer at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Douglas G. Shotton

Douglas Shotton worked for the United States Engineer District Office.