National Museum of Nuclear Science & History
Gus Essig began working on the Manhattan Project in May, 1946 in Dayton, Ohio. Essig was selected to work in the highly classified initiator program and spent several months at Los Alamos learning how to design and construct initiators.
J. F. Ryan worked for Clinton Laboratories at the X-10 Reactor.
Dr. Leslie T. McClinton was a research assistant at the University of Chicago Met Lab. After three months of working at the Met Lab, McClinton was transferred to Oak Ridge in 1943.