John Hart of Chester County, the 2nd son of Col. Joseph Hart, of Bucks County, was born at Warminster, 11-29-1743.  He married, 9-13-1767, Rebecca Rees, of the Crooked Billet, and soon after removed to Chester County, where he purchased a mill and land near "Old Church".  From Chester county he was a delegate to the conference of the provincial deputies, held July 15, 1774, a member of the Constitutional Convention of July 15, 1776, and appointed justice of the peace July 25, 1777.  Owing to his warm espousal of the cause of the colonies, he was so persecuted by the Tories in 1778 that he was obliged to leave his mill and return to Bucks County, where he spent the remainder of his life.  In the spring of 1779 he succeeded Henry Wynkoop as treasurer of Bucks County, and was one of the victims of the Doane robberies, in October of 1781.  He died at Newtown, June 5, 1786, at the age of 43 years.