Paterson was selected as the Somerset County delegate for the first three provincial congresses of New Jersey, where, as secretary, he recorded the 1776 New Jersey State Constitution. After Independence, Paterson was appointed as the first Attorney General of New Jersey, serving from 1776 to 1783, maintaining law and order and establishing himself as one of the state's most prominent lawyers. He was sent to the 1787 Philadelphia Convention in Philadelphia, Pennsylvania where he proposed the New Jersey Plan for a unicameral legislative body with equal representation from each state. After the Great Compromise (for two legislative bodies: a Senate with equal representation for each state, and a House of Representatives with representation based on population), the Constitution was signed.