Van Alen was born in
Kinderhook in the
Province of New York, the son of Adam and Mary Van Alen. After completing his studies he became a farmer. He moved to
Defreestville and continued to farm, also serving in local offices including justice of the peace. He also became involved in civil engineering and surveying. During the
American Revolution he served as a private in the
7th Regiment (Abraham Van Alstyne's) of the Albany County Militia. In 1790, he surveyed the town of
Greenbush where he later operated a general store. ==Political career==