National Museum of Nuclear Science & History
Marshall Holloway was an American physicist. He received his PhD in physics from Cornell University. In 1942, he directed a secret Manhattan Project assignment at Purdue University.
Raphael Semmes worked for Clinton Laboratories at the X-10 Reactor.
Charles J. Spiegl was a civilian scientist employed by the Manhattan Project. He was involved in radiation toxicology, studying the effects of radiation on animals at the Trinity Site near Alamogordo, New Mexico.
Ralph Watson worked for the Tennessee Eastman Corporation at the Y-12 Plant.
