William J. Ayerst

Leonard Krouldis

Leonard Krouldis was a laboratory helper at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Paul A. Clark

E. J. O’Brien

O'Brien worked for Stone and Webster Engineering Corporation.

A. O. Groth

A. O. Groth worked for the Tennessee Eastman Corporation at the Y-12 Plant.