National Museum of Nuclear Science & History
Frank Pratt worked for the J.A. Jones Construction Company.
Ayres worked in the United States Engineer District Office.
John F. Van Doren worked on the procurement and property staff at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Stephen Lawroski was an American chemical engineer who worked on the Manhattan Project at the University of Chicago’s Metallurgical Laboratory from 1944-1946.
