Irénée du Pont, Jr.

Irénée du Pont, Jr. is a member of the storied du Pont family and the son of the President (1919 to 1925) of the E. I. du Pont de Nemours and Company. The DuPont Company played a crucial role in the Manhattan Project; in 1942, DuPont was enlisted to design and build the project facilities at Hanford, including the B Reactor. Du Pont’s second oldest sister, Margaretta, married Crawford Greenewalt, a famous Manhattan Project scientist and chemical engineer who served as liaison between the Met Lab physicists and the DuPont engineers working on the B Reactor.