Francis “Frank” Pierre Gentieu (1876-1950) was a ballistic engineer at E.I. du Pont de Nemours & Company, a chemical company more commonly referred to as the DuPont company. Gentieu worked at DuPont's Carney's Point Plant in New Jersey from 1901 to 1941. This small collection contains an account by Gentieu entitled "The First Fifty Years at Carney's Point" (1891-1941); correspondence with du Pont family members; a list of his father Pierre Gentieu's photographs of the DuPont Company and Brandywine area; and a recollection written by Samuel Brown of a conversation with Sophie M. du Pont (1810-1888) related to the Brandywine Manufacturers Sunday School.

Pierre Gentieu (1842-1930) was an artist, photographer, and an employee of the DuPont Company for thirty-four years. Pierre Gentieu and his wife, Sarah Albina "Binie" Gentieu (1846-1925) had six children. Although three children had no issue, they had nine grandchildren and twenty great grandchildren. All six children worked for the DuPont Co. and several grandchildren did as well. This collection consists of nine albums that document the Gentieu family history, primarily the life of the patriarch of the family Pierre Gentieu (1842-1930). The albums contain originals and reproductions of correspondence, family trees, documents, photographs, and ephemera.