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National Museum of Nuclear Science & History

Nancy Greenewalt Frederick

Child of Manhattan Project VeteranWilmington, DE

Family Member of Manhattan Project Veteran
Nancy Greenewalt Frederick Listen to Nancy Greenewalt Frederick’s Oral History on Voices of the Manhattan Project

Nancy Greenewalt Frederick is the oldest daughter of Crawford Greenewalt, a chemical engineer who worked on the Manhattan Project and later become president of the DuPont Company. 

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Dunell Cohn

Oak Ridge, TN

Dunell Cohn was born in Oak Ridge, Tennessee, in 1944. Cohn’s father, Waldo, was recruited to work on the Manhattan Project in Chicago in 1942 for his work on radioisotopes at Berkeley and Harvard during the 1930s.

Herbert “Herb” W. Depke

Hanford, WA

Herb Depke arrived in Hanford in 1943 after his father was transferred by the DuPont Company to work as an expediter during the Manhattan Project.

Gale Young

Chicago, IL

Gale Young was a research associate in theoretical studies at the University of Chicago Met Lab. Before joining the Manhattan Project in 1942, Young taught mathematics and physics at Olivet College.

Raymond C. Grills

Research & Development/300 Area

Raymond C. Grills is an American physical chemist who worked at the University of Chicago’s Metallurgical Laboratory and at Hanford during the Manhattan Project.