Bob Parks

Leonard Krouldis

Leonard Krouldis was a laboratory helper at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Walter S. Carpenter, Jr.

Walter Samuel Carpenter, Jr. was a corporate executive at DuPont who oversaw the company's involvement in the Manhattan Project.

R. P. Seven

R. P. Seven worked for the United States Engineer District Office.

Calvin J. Brown