A graduate of Trinity University and St. Mary's School of Law, both in San Antonio, Texas, Cornyn also earned a Masters of Law from the University of Virginia Law School in 1995.
After serving six years as a District Court Judge in San Antonio, Texas, he was elected to the Texas Supreme Court in 1990 and re-elected in 1996. He resigned from the Supreme Court in 1997 to run for Attorney General. When elected, he became the first Republican to win the position since Reconstruction. He has now left this position to become a member of the United States Senate, in which he still serves as of November 2003.