LeRoy R. Raffel

Ben Benjamin

Ben Benjamin was a sergeant in the Special Engineer Detachment during the Manhattan Project. He had previously worked in industry making lenses and prisms, and was assigned to the Optics Group to help with photographing the Trinity Test.

Katherine Gnjec

Katherine Gnjec was a laboratory assistant in the Chemistry Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Harold G. Mathes

L. G. A. Casey