Jacob L. Martin was an American diplomat. He held the post of Chief Clerk of the U.S. State Department from July 16, 1840, to March 5, 1841. For just two days, March 4 and March 5, 1841, he held the ad interim chair of the United States Secretary of State. Born: June 1810 Died: August 26, 1848 In office: March 4, 1841 – March 5, 1841 Wiki link