National Museum of Nuclear Science & History
Henry Brzostowski worked for the Roane-Anderson Company.
H. N. Fox worked for the Union Carbide & Carbon Corporation.
Grace Hardin worked for the J.A. Jones Construction Company.
Richard Emanatian was with the military police detachment at Los Alamos during the war. He maintained secrecy through the rest of his life, and his family only found about his involvement long after his death.