Meantime, Paterson had studied law in the city of Princeton under Richard Stockton, who later was to sign the Declaration of Independence, and near the end of the decade began practicing at New Bromley, in Hunterdon County. Before long, he moved to South Branch, in Somerset County, and then in 1779 relocated near New Brunswick at Raritan estate.
When the War for Independence broke out, Paterson joined the vanguard of the New Jersey patriots. He served in the provincial congress (1775-76), the constitutional convention (1776), legislative council (1776-77), and council of safety (1777). During the last year, he also held a militia commission. From 1776 to 1783 he was attorney general of New Jersey, a task that occupied so much of his time that it prevented him from accepting election to the Continental Congress in 1780. Meantime, the year before, he had married Cornelia Bell, by whom he had three children before her death in 1783. Two years later, he took a new bride, Euphemia White, but it is not known whether or not they had children.
From 1783, when he moved into the city of New Brunswick, until 1787, Paterson devoted his energies to the law and stayed out of the public limelight. Then he was chosen to represent New Jersey at the Constitutional Convention, which he attended only until late July. Until then, he took notes of the proceedings. More importantly, he figured prominently