Former <a href="https://en.wikipedia.org/wiki/President_of_the_United_States" id="mw3A" rel="mw:WikiLink" title="President of the United States">president of the United States</a> <a href="https://en.wikipedia.org/wiki/William_Howard_Taft" id="mw3Q" rel="mw:WikiLink" title="William Howard Taft">William Howard Taft</a> is sworn in as 10th <a href="https://en.wikipedia.org/wiki/Chief_Justice_of_the_United_States" id="mw3g" rel="mw:WikiLink" title="Chief Justice of the United States">chief justice</a> of the <a href="https://en.wikipedia.org/wiki/Supreme_Court_of_the_United_States" id="mw3w" rel="mw:WikiLink" title="Supreme Court of the United States">U.S. Supreme Court</a>, becoming the only person ever to hold both offices.