He is sometimes confused with his son, another Texas state legislator who was also known as William Clark Jr. (1828–1884).
They lived in Georgia before moving to Sabine County, Texas in 1835, where he operated a successful store.
Following the convention, interim President David G Burnet of the Republic of Texas, was assisted by Clark by creating a system to collect supplies and other goods for the army to fight against the invading Mexican army.
[1] Clark briefly served as a representative of Sabine County in the House of the Second Congress in 1837 and left in 1838 due to illness.
Following the war, and after recovering from his illness, he stayed in Sabine County until he purchased the Planter Hotel in Nacogdoches in 1859, located in East Texas.