Leon Horton

James Downey

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

K.G. Jones

Jones worked at the 300 Area at Hanford during the Manhattan Project.

S. R. Brown

Mary M. Fair

Mary Fair worked as a lab assistant at the Metallurgical Lab at the University of Chicago. She was not sure of the purpose of her work, but often used radiation detecting devices in the experiments.