Kent was the son of Moss Kent, a Lawyer from Dutchess County, New York and the first Surrogate of Rensselaer County, New York. He graduated from Yale College in 1781, having helped establish the Phi Beta Kappa Society there in 1780, and began to practice law at Poughkeepsie, New York in 1785 as an attorney, and in 1787 at the bar. In 1791 and 1792-93 Kent was a member from Dutchess County of the New York State Assembly. In 1793, he removed to New York City, where he was appointed a master in chancery for the city.