National Museum of Nuclear Science & History
Clarence H. Mathews was a janitor at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
Pfeiff worked in the 200 West Area at Hanford during the Manhattan Project.
Leo A. Ohlinger was a senior engineer at the University of Chicago Met Lab. Ohlinger was also Section Chief of P-IX, Engineering Physics.
Hoferer worked at the 100-F Area at Hanford during the Manhattan Project.
