National Museum of Nuclear Science & History
Robert Ellingson arrived in Oak Ridge in June 1943. Shortly after Ellingson arrived, however, he was informed by his employer, Tennessee Eastman, that they already had too many chemists and chemical engineers.
Jack Rose was a machinist and armorer in the Special Engineering Detachment (SED) assigned to the 509th Composite Group in Wendover, Utah.
Joseph Hirschfelder was an American physicist. He held doctorates in physics and chemistry from Princeton University.
Lawrence Langer served in the Special Engineering Detachment and Project Alberta as part of the team that transported and assembled the Little Boy and Fat Man atomic bombs.
