American President A Reference Resource ↑ Millard Fillmore Front PageThomas M. T. McKennan (1850–1850): Secretary of the InteriorThomas McKean Thompson McKennan was born in 1794 in New Castle, Delaware, and graduated from Washington College (later Washington and Jefferson College) in Pennsylvania. McKennan then worked as a tutor in ancient languages, studied law, and was admitted to the bar in 1814. From 1815 to 1817, McKennan served as attorney general of Washington County, Pennsylvania, before becoming a member of Washington’s town council from 1818 to 1831. In 1830, McKennan was elected to the U.S. House of Representatives, where he served three terms, from 1831 to 1839, and part of fourth term from 1842 to 1843. President Millard Fillmore tapped McKennan in 1843 to fill the vacancy in the Interior Department left by Thomas Ewing’s resignation. McKennan served only eleven days before he resigned his duties due to illness. Little is known about Thomas McKennan’s life from his resignation in 1843 until his death in 1852.