Name Portrait Appointment Presentation Termination Appointer Notes John Adams February 24, 1785 June 1, 1785 February 20, 1788 Congress Second President of the United States[lower-alpha 1] Thomas Pinckney January 12, 1792 August 9, 1792 July 27, 1796 George Washington Rufus King May 20, 1796 July 27, 1796 May 16, 1803 James Monroe 1803 August 17, 1803 October 7, 1807 Thomas Jefferson Fifth President of the United States William Pinkney February 26, 1808 April 27, 1808 May 7, 1811 Jonathan Russell July 27, 1811 November 15, 1811 June 18, 1812 James Madison [lower-alpha 2]