William Poindexter Thommasson was born on October 8, 1797, in New Castle, Kentucky.[1] Thomasson completed preparatory studies. He served in Captain Duncan's company in the War of 1812.[1]
Thomasson served as member of the Indiana House of Representatives in 1818–1820. He served as prosecuting attorney of Corydon in 1818. He moved to Louisville, Kentucky, in 1841.[1] After moving to Louisville, he became city attorney and county attorney.[2]
Thomasson was elected as a Whig to the Twenty-eighth and Twenty-ninth Congresses (March 4, 1843 – March 3, 1847). He declined to be a candidate for renomination. He moved to Chicago, Illinois, and resumed the practice of law.[1]
During the Civil War, Thomasson served in the Union Army in the Seventy-first Regiment, New York Volunteer Infantry.[1]
Personal life
Thomasson married Charlotte Leonard of Floyd County, Indiana in 1825. They had four children: Nelson, John J., Saran and Laura.[2]