National Museum of Nuclear Science & History
Sidney Williams was a janitor at the University of Chicago’s Metallurgical Lab (“Met Lab”) during the Manhattan Project.
Johnston worked at the 300 Area at Hanford during the Manhattan Project.
Holman worked for Stone and Webster Engineering Corporation.
Lyle Crowe worked for the J.A. Jones Construction Company.
Myfanwy Pritchard Roberts worked in Rhydymwyn, Wales as a laboratory assistant in the Tube Alloys program, the British mission to create the nuclear bomb.