Earl L. Karr

A. C. Beem

G. C. Chappell

Chappell worked in the United States Engineer District Office.

Norman H. Nachtrieb

Norman Harry Nachtrieb was an American chemist who worked on the Manhattan Project at the University of Chicago and Los Alamos.

Fredrick “Fred” D. Johnson

Fredrick “Fred” D. Johnson was a research assistant at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.