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.
Johnston worked at the 200 West Area at Hanford during the Manhattan Project.
Eva Pennartz worked for the Roane-Anderson Company.
Margaret M. Emmerson was a technician at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.