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.
R. Althoff worked for the J.A. Jones Construction Company.
Ernest William Titterton was a British nuclear physicist who worked on the Manhattan Project as part of the British Mission to Los Alamos.
Aaron Novick was a physical chemist at various Manhattan Project sites, including the University of Chicago, Hanford, Washington, and Los Alamos, New Mexico.