O'Brien 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.
William P. Norris
William P. Norris was an associate bio-chemist at the University of Chicago Met Lab. After a stint at the Dow Chemical Company, he joined the Manhattan Project in July 1944.
Daniel Lasovick was a scientist at Los Alamos during the Manhattan Project. After the war, Lasovick turned down an offer to go to the University of California, Berkeley with the Atomic Energy Commission to enter private industry.