Martin J. Costello

J. F. Gebhardt

Gebhardt worked for Stone and Webster Engineering Corporation.

Margaret M. Emmerson

Margaret M. Emmerson was a technician at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

P.P. Springer

Springer worked at the 200 West Area at Hanford during the Manhattan Project.

Marvin C. Yoder