Alvin R. Arnold

Daniel J. Keefe

Daniel J. Keefe was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Walter Johnson

Johnson worked for Stone and Webster Engineering Corporation.

George Mahfouz

George Mahfouz joined the Manhattan Project in 1943 when he was offered a job at the Houdaille-Hershey nickel plant in Decatur, Illinois.

W. W. Goode