National Museum of Nuclear Science & History
Creedon worked for Stone and Webster Engineering Corporation.
T. J. Kelly worked for the Kellex Corporation at the K-25 Plant.
Michael Cefola was an American chemist and a research associate at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
H. J. Ratjen worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Helen D. Thomson was in the Army Group at the Metallurgical Laboratory in Chicago during the Manhattan Project.
