John Roberts is the current Chief Justice of the United States, having been nominated by President George W. Bush and confirmed in 2005. A graduate of Harvard Law School, he previously served as a judge on the U.S. Court of Appeals for the D.C. Circuit. Known for his conservative judicial philosophy and pragmatic approach, Roberts has presided over numerous landmark cases, often seeking to build consensus and maintain the institutional legitimacy of the Supreme Court. His rulings and opinions have had a significant impact on American law and society.