National Museum of Nuclear Science & History
Fred Atkinson worked for the H. E. Anning Company.
J. E. Davidson worked for the J.A. Jones Construction Company.
Howard Parsons was an American physicist. Parsons was born in Chicago in 1920. He receieved a B.S. from the University of Chicago, and shortly afterwards was hired to work on the Manhattan Project as a research assistant at the Chicago Met Lab.