The Chief Justice brings together leading scholars of the courts who employ social science theory and research to explain the role of the Chief Justice of the U.S. Supreme Court. They consider the chief justice's appointment, office, powers, and influence both within the Court and in the American system of government more generally. The chief justice presides over oral arguments and the justices' private conferences. The chief justice speaks first in those conferences, presents cases and other matters to the other justices, and assigns the Court's opinions in all cases in which the chief justice votes with the majority. In addition, the chief justice presides over the Judicial Conference of the United States, a policy-making body composed of lower-court federal judges. As Chief Justice Charles Evans Hughes wrote, the Chief Justice of the U.S. Supreme Court is "the most important judicial officer in the world."