National Museum of Nuclear Science & History
Sidney Williams was a janitor at the University of Chicago’s Metallurgical Lab (“Met Lab”) during the Manhattan Project.
George Maronde was a security guard at the University of Chicago Metallurgical Lab. He stood guard outside Stagg Field when Chicago Pile-1 went critical on December 2, 1942.
A. J. D’Arcy worked for the Union Carbide & Carbon Corporation.
Paul R. O’Connor was a junior chemist at the University of Chicago Met Lab during the Manhattan Project.
Adelaide Laws worked for the Tennessee Eastman Corporation at the Y-12 Plant.