National Museum of Nuclear Science & History
Joseph “Joe” A. Haaga (1919-1974) was a nuclear engineer who worked on the Manhattan Project. Born in 1919, Haaga graduated from Notre Dame in June 1940 with a B.
Russell E. Gackenbach served as a 2nd Lieutenant in the 393rd Bombardment Squadron and in the 509th Composite Group.
Dorothy Isgett worked for the Tennessee Eastman Corporation at the Y-12 Plant.
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.
