National Museum of Nuclear Science & History
O'Brien worked for Stone and Webster Engineering Corporation.
Hiser worked at the 300 Area at Hanford during the Manhattan Project.
R. A. Mathews worked for the United States Engineer District Office.
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.
Luther Ramsey was a staff worker at Los Alamos during the Manhattan Project.
