Sandra Day O'Connor is an American jurist. She served as an Associate Justice of the Supreme Court of the United States from 1981 until her retirement from the bench in 2006. The first woman to serve on the Supreme Court, she served as a crucial swing vote in some cases due to her case-by-case approach to jurisprudence and her somewhat moderate political views. However, during her time on the Court, she voted with the conservative Chief Justice William Rehnquist more than with any other justice.