National Museum of Nuclear Science & History
O'Brien worked for Stone and Webster Engineering Corporation.
Guy Fisher worked for the J.A. Jones Construction Company.
Richard Popham oversaw radiation safety in the Chemistry-Metallurgy Division at Los Alamos during the Manhattan Project.
Ralph Nobles was one of three brothers to work on the Manhattan Project. He and his brother William worked at Los Alamos, while brother Robert was at the University of Chicago’s Metallurgical Laboratory.
