National Museum of Nuclear Science & History
Ralph Spicer worked for the Tennessee Eastman Corporation at the Y-12 Plant.
Robert Rogers was a staff worker at Los Alamos during the Manhattan Project.
Herbert M. Parker (1910-1984) was a British-American medical physicist. He worked at Chicago, Oak Ridge, and Hanford during the Manhattan Project, and is perhaps best known for inventing the rep (a precursor of the rad) and helping develop the rem to measure radiation dosage.
