McKean Thomas (1734–1817), a signer of the Declaration of Independence. McKean was born in Chester County, Pennsylvania. He was admitted to the Delaware bar in 1754 and served in the legislature, 1762–79. McKean was a Delaware delegate to the Continental Congress, 1774–76 and 1778–81, serving briefly as president in 1781, and to the Confederation Congress, 1782–83. From 1777 to 1799 he also was chief justice of Pennsylvania, serving both states at the same time. McKean, a moderate Jeffersonian Republican, was governor of Pennsylvania, 1799–1808.