National Museum of Nuclear Science & History
J. P. Smith worked for the J.A. Jones Construction Company.
Clark worked in the United States Engineer District Office.
C. O. Carpenter worked for the Roane-Anderson Company.
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.
