William Howard Taft was the only President of the United States to also serve as Chief Justice of the Supreme Court. In fact, Taft never really wanted to be President. He preferred law to politics and always aspired to serve on the Supreme Court. But his wife -- who wanted to be first lady -- had other ambitions for him. After four uncomfortable years as President, Taft left the White House and became a Professor of Law at Yale. In 1920, Taft finally realized his true dream when President Harding made him Chief Justice of the Supreme Court, a position which he held until just before his death in 1930.