To join New York Militia. Served as assistant geographer Continental Army, 1778-1780, chief geographer 1780-1781. Surveyor general State of New York, 1784-1834.
A commissioner to settle New York-Pennsylvania boundary dispute, 1786-1787. Surveyor of various canal routes for New York. Published map of New York State, 1802.
Regent, then vice-chancellor University State of New York, 1798-1829, chancellor, 1829-1834. A founder New York Society for Promotion of Agriculture, Arts and Manufactures (later became part of Albany Institute), vice president Albany Institute, many years. Member American Philosophical Society Author: The Elements of Perspective (collection of writings), 1813.
Contributor scientific papers to various journals.
Born December 25, 1756