John Roberts is the 17th Chief Justice of the United States, having been appointed by President George W. Bush in 2005. He plays a crucial role in the Supreme Court, influencing major legal decisions and shaping the interpretation of the Constitution. Roberts is known for his conservative judicial philosophy, but he has also surprised many by occasionally siding with liberal justices on key issues. His leadership style emphasizes consensus and collegiality, aiming to maintain the Court's legitimacy and public trust in the judicial system.