National Museum of Nuclear Science & History
Carl Helrich (1895-1971) was a civil engineer for the J.A. Construction Company from 1943 to 1945 and helped construct the Oak Ridge town site and plant area.
Morris S. Kaplan was a Chemical Engineer for the Houdaille-Hershey Company in Decatur, Illinois. Kaplan was born in Massachusetts in 1921 and grew up in Chicago, Illinois.
Sara B. Chettkow was a laboratory technician in the Health Division of the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
