National Museum of Nuclear Science & History
Mattie was a staff member at Los Alamos during the Manhattan Project.
Julius M. Simmons was an American chemist. He worked as a research assistant at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Farrell worked for Stone and Webster Engineering Corporation.
Warren Smith worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Charles Hensley worked for the United States Engineer District Office.
