Henry Arnold Coster[a] (c. 1840 – November 2, 1917) was an American clubman who was prominent in New York Society during the Gilded Age.
[3] His paternal grandparents were Catherine Margaret (née Holsman) Coster and John Gerard Coster,[4] who came to the United States shortly after the Revolutionary War from Haarlem in the Netherlands and founded the family fortune with his brother through the mercantile firm, "Henry A.
[14] His wife, who was prominent in society in Boston before their marriage, Mary served as vice-president of the Home for Incurables in Fordham.
[12] Together, Harry and Mary were the parents of: Coster died at his country home in Westchester on November 2, 1917.
[30] His widow, who had a summer home in Southampton, New York known as "Wee Cot",[28] died in November 1922 at her residence, 50 East 81st Street, which she inherited from her husband.