William Rufus Day was an American diplomat and jurist who served as an associate justice of the Supreme Court of the United States from 1903 to 1922. Prior to his service on the Supreme Court, Day served as United States Secretary of State during the administration of President William McKinley. He also served as a United States circuit judge of the United States Court of Appeals for the Sixth Circuit and the United States Circuit Courts for the Sixth Circuit.
Official portrait, c. 1903–22
Associate Justice of the Supreme Court of the United States
An associate justice of the Supreme Court of the United States is a justice of the Supreme Court of the United States, other than the chief justice of the United States. The number of associate justices is eight, as set by the Judiciary Act of 1869.
Clarence Thomas, since October 23, 1991
Samuel Alito, since January 31, 2006
Sonia Sotomayor, since August 8, 2009
Elena Kagan, since August 7, 2010