George R. Holdren

R. M. Williams

W. O. Wigtil

W. O. Wigtil worked for the Tennessee Eastman Corporation at the Y-12 Plant.

H.A. Fettinger

H.A. Fettinger was a junior physicist at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

John M. Sprecher

John M. Sprecher was a chemical engineer. During the Manhattan Project, he worked for DuPont in Wilmington, DE.