John P. Wittemore

R. E. Millard

August “Gus” Knuth

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.

M. A. Richtmyer

M. A. Richtmyer worked for the Tennessee Eastman Corporation at the Y-12 Plant.

Joseph Kouba

Joseph Kouba was a janitor at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.