Harmen Harmanse was the patriarch of the Gansevoort family in Albany, New York, arriving in the area by 1657. Although not the first Ten Eyck in America, Jacob C. Ten Eyck was the first to come to Albany, moving from Manhattan after 1654. The two families intermarried several times over the years, along with other Dutch families in the area. This collection includes correspondence, financial records, estate records, and other family-related information.

Thomas Worth Olcott (1795-1880) was born in Hudson, Columbia County, New York, to Josiah and Carolina Worth Olcott. Olcott eventually became president of the Mechanics and Farmer Bank in Albany, New York, and served on the boards of the Albany Law School and the Dudley Observatory, among others. This collection contains estate records, correspondence, newspaper clippings, bills, account books, photographs, scrapbooks, and genealogical information.