The Constitution names only three congressional offices: the Speaker of the House, the President of the Senate, and the President pro tempore. Everything else, from majority leaders to whips, grew out of the party system in the late nineteenth and early twentieth centuries. Today leadership determines which bills reach the floor, how debate is structured, and how each party presents its agenda.
This guide explains each leadership post, how it is filled, and how leaders use their power, with links to full entries. Following briefgov practice, current officeholders are listed in each entry's key facts.
Each chamber elects officers who are not members. The Clerk of the House and the Secretary of the Senate keep official records, the sergeants at arms maintain order and security, and the parliamentarians advise presiding officers on rules and precedents. Joint officers include the Architect of the Capitol, who maintains the buildings, and the Capitol Police board, which oversees security.
Committee chairs come from the majority party and control their committee's agenda, hearings, and staff. The senior minority member is the ranking member. Seniority traditionally determined chairs, but House Republicans have limited chairs to three terms since 1995, and both parties now let their conferences choose chairs. The chairs of the appropriations and tax-writing committees are among the most powerful members of Congress.
Leaders are powerful but depend on keeping their members together. Narrow majorities give small factions, such as the House Freedom Caucus or the bipartisan Problem Solvers Caucus, leverage over leaders, and rank-and-file members can bypass leaders with discharge petitions. In the Senate, majority leaders have used the nuclear option to change rules by simple majority. Supporters of strong leadership say it lets Congress act, while critics say centralized control sidelines committees and individual members.
Each party in each chamber organizes as a caucus or conference, which meets after every election to choose its leaders, set committee assignments, and adopt party rules. The two-party system means the majority party controls each chamber's leadership and committee chairs. Leaders are chosen by fellow members, not by voters, though a member must win reelection at home to stay in leadership.
The Speaker is elected by the full House, needing a majority of members voting for a named candidate. In January 2023 the election took 15 ballots, the most since 1859, and in October 2023 the House removed a Speaker through a motion to vacate for the first time. The majority leader manages the floor schedule, the minority leader leads the opposition, and each party's whip counts and rounds up votes. The Speaker's influence over the Rules Committee is a key source of control.
The Vice President is the Senate's constitutional presiding officer but appears mainly for ceremonies and tie-breaking votes. The President pro tempore presides in the Vice President's absence, though junior senators usually take turns in the chair. The majority leader, a post that emerged in the 1920s, holds the right of first recognition, letting the leader offer motions and amendments before anyone else, which makes the office the Senate's agenda-setter. The minority leader negotiates with the majority over schedules, unanimous consent agreements, and cloture.
See the full institution in how Congress works, compare the chambers in the House vs. the Senate, or meet the rest of the government in who's who: offices and titles.