National Museum of Nuclear Science & History
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.
Dr. Julia Maestas is the granddaughter of Manuel Maestas, a homesteader at Los Alamos, and daughter of Elipio Maestas, who worked as a civil guard for the Corps of Engineers at Los Alamos.
Sergeant Frank Karcher was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
