National Museum of Nuclear Science & History
Lou Evelyn Weisser was a staff worker at Los Alamos during the Manhattan Project.
Lawrence Litz was a young physicist when he began working on radioactivity at the Metallurgical Laboratory at the University of Chicago.
Seymour Calvert served for 11 months in the Special Engineering Detachment at Los Alamos. He specialized as a chemical engineer, and carried out experiments with beryllium that were often dangerous.
Arthur Scott Weygandt was a chemical engineer at DuPont.
Caldwell worked in the United States Engineer District Office.