H.F. Johnstone

F. M. Cochran

Joanna Brumfiel

Joanna Brumfiel was a stenographer at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Frank J. Schnettler

Frank J. Schnettler was an American metallurgist who studied the properties of plutonium at Los Alamos.

Helen D. Thomson

Helen D. Thomson was in the Army Group at the Metallurgical Laboratory in Chicago during the Manhattan Project.