National Museum of Nuclear Science & History
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.
Ford worked for Stone and Webster Engineering Corporation.
George Weisiger worked at Oak Ridge during the Manhattan Project, although it remains unknown what his specific duties were.
