Josiah Simpson, born in the 1780s, had a short but successful career in law. In 1812, President Madison appointed him as United States judge for the Mississippi Territory. He served as an influential delegate to the Mississippi state Constitutional Convention in 1817, but died soon afterwards.
From the description of Josiah Simpson papers, 1804-1805 [manuscript]. WorldCat record id: 37809785
From the guide to the Josiah Simpson Papers, 1804-1805, (University of North Carolina at Chapel Hill. Library. Southern Historical Collection.)