National Museum of Nuclear Science & History
H. V. Appen worked for the J.A. Jones Construction Company.
James Murray was a security officer at Los Alamos during the Manhattan Project. He led a plainclothes operation under the pseudonym Paul Sheridan, and suspected J.
John O’Gara worked for the United States Engineer District Office.
Margaret Brown was a stenographer at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
