Thomas Jefferson was an American statesman, diplomat, lawyer, architect, philosopher, and Founding Father who served as the third president of the United States from 1801 to 1809.[12] Among the Committee of Five charged by the Second Continental Congress with drafting the Declaration of Independence, Jefferson was the document's primary author. Following the American Revolutionary War and prior to becoming president in 1801, Jefferson was the 1st U.S. secretary of state and 2nd Vice President 