James R. Lynch

Willis Gelder

A. J. Diener

Diener worked for Stone and Webster Engineering Corporation.

J. Howard Parsons

Howard Parsons was an American physicist. Parsons was born in Chicago in 1920. He receieved a B.S. from the University of Chicago, and shortly afterwards was hired to work on the Manhattan Project as a research assistant at the Chicago Met Lab.

Joseph Caldwell

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