Lammont duPont (sometimes spelled Lammot) was born near Wilmington, Delaware on October 12, 1880 and died on July 24, 1952. He graduated from Massachusetts Institute of Technology in 1901 and joined the family firm in 1902. He was married several times and had a total of 10 children. He was president of E.I. duPont de Nemours & Co. from 1926 to 1940 and chairman of the board from 1940 to 1948.