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National Museum of Nuclear Science & History

H. M. Ellis, Jr.

Project StaffOak Ridge, TN

Los Alamos, NM
Manhattan Project VeteranProject Worker/Staff
The Chapel on the Hill in Oak Ridge

H. M. Ellis, Jr. worked for the Roane-Anderson Company.

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Herbert M. Parker

Research & Development/300 Area

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.