National Museum of Nuclear Science & History
MacDonald worked for Stone and Webster Engineering Corporation.
John Arnold joined the Manhattan Project in 1943 when the MED tasked his employer, the Kellogg Corporation, with developing a special barrier for the gaseous diffusion plant in Oak Ridge.
Earl Long was an American chemical physicist. He served as director of the University of Chicago Institute for the Study of Metals.
M. R. Pierce worked for the Kellex Corporation at the K-25 Plant.
