A. R. Beeson

Mathias A. Klinger

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

P. B. Peterman

Samuel P. Massie Jr.

Samuel Proctor Massie Jr. (1919-2005) was an African American chemist who worked on the Manhattan Project.

H. A. Laybourn