National Museum of Nuclear Science & History
Attended Brooklyn College.
Jack L. Callan was a laborer at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Jas Hoff worked for the United States Engineer District Office.
Otto Hillig was a Danish machinist who helped work on various projects in the early days of the Manhattan Project.
J. C. Freer worked for the Roane-Anderson Company.