Dr. Thomas McKennan was born in Washington, Pa. on May 21, 1825, the son of Thomas M.T. McKennan. He graduated from Washington College in 1842. After his graduation from the University of Pennsylvania Medical School, he eventually returned to Washington and practiced medicine for 44 years, from 1851 to 1895. He served as trustee at both Washington & Jefferson College and the Washington Female Seminary. He died on August 8, 1895.