Designed by Richard Upjohn, architect of Trinity Church and the entrance gate to Green-Wood.
From the Green-Wood website:
Henry Evelyn Pierrepont was known as the “first citizen” of Brooklyn for good reason. He, along with his father Hezekiah B. and mother Anna Maria before him, played a significant role in the planning of Brooklyn as a physical city, its crucial ferry services to New York, and the establishment of Green-Wood Cemetery itself. He is considered by some to be one of the first “city planners” in the United States, a logical evolution from his father’s status as the first important suburban (Brooklyn Heights) real-estate developer in American History. Pierrepont Street in the Heights commemorates the family to this day.