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.
Catherine Cordoba worked at the Houdaille Hershey plant in Decatur, Illinois on the night shift of the plating department.
Mary Argo was a physicist at Los Alamos during the Manhattan Project. She and her husband, physicist Harold Argo, were students of Edward Teller.
Arthur Weisberg was a mechanical engineer with the Special Engineer Detachment assigned to the Metallurgical Lab at the University of Chicago.