Henry du Pont (1812-1889) was the second son of Eleuthère Irénée du Pont (1771-1834) and senior partner of E.I du Pont de Nemours & Company from 1850 to 1889. The collection consists of materials relating to the descendants of Henry and Louisa Gerhard du Pont. Primarily, the collection consists of portraits and other photographs of their daughters Evelina, Ellen, Louisa, Sara, Victorine, Sophie and other family members.

Lammot du Pont Copeland (1905-1983) was an American businessman, great-great-grandson of E.I. du Pont (1771-1834), and chief executive officer of E.I. du Pont de Nemours & Company. This collection primarily consists of portrait photographs of members of the du Pont, Belin, Copeland, Gratiot, La Motte, and related families. There are also two small booklets containing prints of various du Pont and Cunningham homes.

Pamela Cunningham Copeland (1906-2001) and Lammot du Pont Copeland (1905-1983) were active in the land conservation movement, cultural institutions (including both the Hagley and Winterthur Museums), and local civic and philanthropic work. The collection contains photographs of Pamela and Lammot du Pont Copeland and family members. Many of the pictures document the couple's various activities and philanthropic endeavors.

Lammot du Pont (1831-1884) was a chemist and inventor, he was the grandson of Eleuthere Irenee du Pont (1771-1834), founder of E.I. du Pont de Nemours & Company, more commonly known as the DuPont Company. This collection contains photographs of Brandywine, Hagley area, and the family of Lammot du Pont and Mary Belin du Pont (1839-1913).

William du Pont, Sr. (1855-1928) was an industrialist and member of the prominent du Pont family of Delaware, whose family business was the E.I. du Pont de Nemours & Company, also known as the DuPont Company which was a large manufacturer of gunpowder. He worked for the first DuPont dynamite manufacturer, Repauno Chemical Company, as secretary and treasurer (1880-1884) and after the tragic death of Lammot du Pont (1831-1884), as president (1884-1892). William du Pont, Jr. was the youngest child of du Pont, Sr. and Annie Rogers Zinn du Pont (1858-1827). Du Pont Jr. became the president of Delaware Trust Company in 1929, the youngest bank president in Wilmington at that time. In 1952, he became chairman of the board, retaining both positions until his death in 1965. This collections consists of photographic material mostly relating to the U.S.F. Powder Company, together with the Ball Grain Explosives Company which was in a way U.S.F. Powder Company predecessor. It also includes William du Pont's family photographs and negatives.