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This article is part of the series: Politics and government of the United States
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The Chief Justice of the United States is the head of the judicial branch of the government of the United States, and presides over the U.S. Supreme Court. The highest judicial officer in the country, the Chief Justice leads the business of the Supreme Court and presides over the Senate during impeachment trials of the President. In modern tradition, the Chief Justice also has the duty of administering the oath of office to the President, but this is not required by the Constitution or any other law.
The seventeenth and current Chief Justice is John Roberts, who was nominated by President George W. Bush, and took office on September 29, 2005 upon confirmation by the U.S. Senate.

Duties
Article I, section 3 of the U.S. Constitution stipulates that the Chief Justice shall preside over impeachment trials of the President of the United States in the U.S. Senate. Two Chief Justices, Salmon P. Chase and William Rehnquist, have had the duty of presiding over the trial in the Senate that follows an impeachment of the President – Chase in 1868 over the proceedings of President Andrew Johnson and Rehnquist in 1999 over the proceedings against President Bill Clinton.
Further, the Chief Justice would preside over the impeachment trial of the Vice President if, under the terms of the 25th Amendment, the Vice President is serving as Acting President. However, no Vice President has been impeached (though Spiro Agnew resigned under threat of impeachment), and none has been Acting President for more than a few hours.

Impeachment trials
The Chief Justice is considered to be the justice with most seniority, independent of the number of years of service in the Court. As a result, the Chief Justice chairs the conferences where cases are discussed and voted on by the justices. The Chief Justice normally speaks first, and so has great influence in framing the discussion.
The Chief Justice sets the agenda for the weekly meetings where the justices review the petitions for certiorari, to decide whether to hear or deny each case. Less than one percent of cases petitioned to the Supreme Court are agreed to be heard. While Associate Justices may append items to the weekly agenda, in practice this initial agenda setting power of the Chief Justice has significant influence over the direction of the court.
Despite the seniority and added prestige, the Chief Justice's vote carries no more legal weight than those of the other eight justices. However, in any vote, the most senior justice in the majority has the power to decide who will write the Opinion of the Court. Since the Chief Justice is always considered the most senior member, if he or she is in the majority then the Chief Justice decides who will write the Opinion of the Court. This power to determine the author of the Court's opinion (including the choice to select him or herself) allows a Chief Justice who is in the majority to influence the historical record. Two justices in the same majority, given the opportunity, might write very different majority opinions (as evidenced by many concurring opinions); being assigned the majority may also cement the vote of an Associate who is viewed as only marginally in the majority (a tactic that was reportedly used to some effect by Earl Warren). A Chief Justice who knows his Associates can therefore do much—by the simple act of selecting the justice who writes the Opinion of the Court—to affect the "flavor" of the opinion, which in turn can impact the interpretation of that opinion in cases before lower courts in the years to come. It is said that some chief justices, notably Earl Warren and Warren Burger, sometimes switched votes to a majority they disagreed with in order to be able to use this prerogative of the Chief Justice to dictate who would write the opinion.

Seniority
The Chief Justice administers the oath of office at the inauguration of the President of the United States. This is a traditional rather than constitutional responsibility of the Chief Justice. All federal and state judges, as well as notaries public, are empowered by law to administer oaths and affirmations.
The Chief Justice of the United States did not administer the initial oath of office to seven Presidents. United States district court Judge Sarah T. Hughes administered the oath to Lyndon Johnson after the John F. Kennedy assassination. John Tyler, Millard Fillmore, Chester A. Arthur, and Theodore Roosevelt's initial oaths reflected the unexpected nature of their taking office.

Oath of office
The Chief Justice also:

Serves as the head of the Judicial Conference of the United States, the chief administrative body of the U.S. federal courts. The Judicial Conference is empowered by the Rules Enabling Act to propose rules, which are then promulgated by the Supreme Court subject to a veto by Congress, to ensure the smooth operation of the federal courts. Major portions of the Federal Rules of Civil Procedure and Federal Rules of Evidence have been adopted by most state legislatures and are considered canonical by American law schools.
Appoints the members of the United States Foreign Intelligence Surveillance Court (or FISC), a "secret court" which oversees requests for surveillance warrants by federal police agencies (primarily the F.B.I.) against suspected foreign intelligence agents inside the United States. (see 50 U.S.C. § 1803).
Appoints the members of the Judicial Panel on Multidistrict Litigation, a special tribunal of seven sitting federal judges responsible for selecting the venue for coordinated pretrial proceedings in situations where multiple related federal actions have been filed in different judicial districts.
Serves ex officio as a member of the Board of Regents, and by custom as the Chancellor of the Smithsonian Institution. List of Chief Justices

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