William Taft served as the 27th President of the United States. He only served for a single term, from the year 1909 to 1913. In today's history, he isn't especially well-known, due to how few things happened during his reign. Of course, just one year after his presidency, WWI started, and that changed everything, but it also made his successor play a much bigger role in international politics.
William was lucky to not have to lead the US during World War I, as that would have been a tough task for any leader to handle. Apart from being the US president, William also served as the tenth Chief Justice of the US (from the year 1921 to 1930), and he is the only person in history to have held these two offices.