H. N. Dayley

Mathias A. Klinger

Mathias A. Klinger was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

John Costa

John Costa worked at the shop in the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

R. J. Brown

Mary F. Stephens

Mary Stephens worked for the United States Engineer District Office.