H. S. Strandholm

Frank E. Keene

Frank E. Keene was a janitor at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

Shelby W. Hill

Shelby Hill worked for the United States Engineer District Office.

F. W. Mattingly

Helen Thomson

Helen Thomson was a techinician in the Chemistry Division at the Metallurgical Laboratory in Chicago during the Manhattan Project.