The term REHNQUIST'S SUCCESSOR refers to John Roberts, who was appointed as the Chief Justice of the United States Supreme Court in 2005. He succeeded William Rehnquist, who had served as Chief Justice since 1986. Roberts was nominated by President George W. Bush and was confirmed by the Senate with a 78-22 vote. He is the 17th Chief Justice of the United States and has served in this role since 2005.