National Museum of Nuclear Science & History
August “Gus” Knuth was a millwright and carpenter who helped construct Chicago Pile-1. He was present on December 2, 1942 when the pile went critical in the first self-sustaining chain reaction in history.
Fred Saak served in the Special Engineer Detatchment (SED) at Los Alamos during the Manhattan Project.
Lawrence Sperry worked for the United States Engineer District Office.
