National Museum of Nuclear Science & History
R. E. Bumgargner worked for the J.A. Jones Construction Company.
Marion Edward Cieslicki was an Polish American metallurgist who worked on the Manhattan Project from 1944 to 1946 at the University of Chicago and at Los Alamos.
J. R. McClellan worked for the Roane-Anderson Company.
Seymour Ratner was a staff worker at Los Alamos during the Manhattan Project.
