Jack Hefner

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 Nuclear Reactor. Later, Hefner transferred to Hanford and worked as a shift engineer, where he monitored the B Reactor and ensured that its operation ran smoothly. Hefner also helped maintain Hanford’s sprawling facilities, including office buildings and houses in the 700 Area.