William Howard Taft was the 27th president of the United States and later became the 10th Chief Justice of the Supreme Court, making him the only person to hold both positions. As president, he broke up more trusts than Theodore Roosevelt and supported the 16th Amendment, which created the income tax, and the 17th Amendment, which allowed people to elect senators directly. After his presidency, he served on the Supreme Court, where he worked to improve the court system.