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National Museum of Nuclear Science & History

Ray Smith is the historian at the Y-12 National Security Complex. His specific focus is the history of Oak Ridge, and he is intimately acquainted with the uranium enrichment processes undertaken at the Y-12, K-25, and S-50 plants during the Manhattan Project, and how the Fat Man and Little Boy bombs worked.

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Harriet Lysaght

Y-12 Plant

Harriet Lysaght worked for the Tennessee Eastman Corporation at the Y-12 Plant.

Robert M. Baer

K-25 Plant

Attended Pennsylvania State University.

Jack Hefner

Tinian Island

Jack Hefner joined the Manhattan Project at Oak Ridge in 1943. Hefner was a reactor engineer and helped supervise the construction of the X-10 Graphite Reactor.

John P. Crisp

Y-12 Plant

John P. Crisp, from Robbinsville, NC, helped construct the K-25 plant in Oak Ridge while working for the G.