Eugene Usdin

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.

A. C. Hudson

A. C. Hudson worked for the Roane-Anderson Company.

J. C. Thompson

J. C. Thompson worked for the Roane-Anderson Company.

Harold A. Hollembeck