John Cornyn, III (born February 2, 1952) is the junior United States Senator for Texas, serving since 2003. He is a member of the Republican Party. He was elected Chairman of the National Republican Senatorial Committee for the 111th U.S. Congress.
Cornyn was born in Houston to John Cornyn, II and Atholene Gale Cornyn (née Danley). He graduated from Trinity University in 1973, where he majored in journalism and was a member of Chi Delta Tau. He earned a J.D. from St. Mary's University School of Law in 1977 and an LL.M. from the University of Virginia School of Law in 1995.
He served in San Antonio for six years as a district judge before being elected as a Republican in 1990 to the Texas Supreme Court, on which he served for seven years. From 1999-2002, Cornyn was the Texas Attorney General, the first of thus far only two Republicans to have held the position. In 2005, Cornyn's name was mentioned among possibilities to replace Supreme Court justices Sandra Day O'Connor or William Rehnquist.