National Museum of Nuclear Science & History
J. B. Marcum worked for the Union Carbide & Carbon Corporation.
Leo P. Hassen was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Attended the City College of New York.
Katherine Gnjec was a laboratory assistant in the Chemistry Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
