Thomas Jefferson was a Founding Father and the third president of the United States, serving from 1801 to 1809. A prolific writer and philosopher, Jefferson was the primary author of the Declaration of Independence. His political philosophy formed the basis for Jeffersonian democracy, which dominated early American politics alongside federalism. Jefferson remains celebrated as an icon of American political values, but is also controversial for being a lifelong slave owner. Born: April 13, 1743 Died: July 4, 1826 In office: March 4, 1797 – March 4, 1801 Wiki link