William Howard Taft was the only U.S. President to also serve as Chief Justice of the Supreme Court. Taft served as President from 1909 to 1913 and then later served as Chief Justice from 1921 to 1930.
Prior to his presidency, Taft had a long career in public service, including stints as a judge and as the Governor-General of the Philippines. After his presidency, he was appointed Chief Justice by President Warren G. Harding. During his time on the Supreme Court, Taft made significant contributions to the development of the judicial system and helped to modernize the Court’s operations. He is widely considered to have been one of the most influential Chief Justices in the history of the Court.