Pioneer physician and preacher. Born in Kentucky. As army surgeon in Texas Revolution (1836), treated General Sam Houston at Battle of San Jacinto. Served in the 1st and 7th Congresses of the Republic. Took part in Mexican War (1846). A firm Unionist during the Civil War (1861-65), he once barely escaped hanging at hands of southern vigilantes. Founded many churches across state. Was married twice; first to Sarah Gehagan and later to Margaret Spencer.