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. Later, he transferred to Hanford and worked as a shift engineer, where he monitored the B Reactor. Hefner also helped maintain Hanford's sprawling facilities, including office buildings and houses in the 700 Area.
Jack Hefner
Reactor EngineerTinian Island
B Reactor/100 AreaHanford, WAOak Ridge, TNX-10 Graphite Reactor
EngineerManhattan Project Veteran
Listen to Jack Hefner’s Oral History on Voices of the Manhattan Project
Jack Hefner’s Timeline
1943 Joined the Manhattan Project at Oak Ridge.