National Museum of Nuclear Science & History
William Gray worked for the Roane-Anderson Company.
Oral Rinehart worked for the Union Carbide & Carbon Corporation.
M. R. Pierce worked for the Kellex Corporation at the K-25 Plant.
Sidney Williams was a janitor at the University of Chicago’s Metallurgical Lab (“Met Lab”) during the Manhattan Project.
Robert Penneman was an American chemist. Penneman was born in 1919 in Springfield, Illinois. He received a B.
