Speaker of the House
The Speaker of the House of Representatives.
Whoever the Majority Party want to be their leader.
The majority party in the US House of Representatives elects the person who will become the Speaker of the House of Representatives. This is a powerful position in the US Congress.
House of Representatives
The House of Representatives.
The highest ranking member of the majority party in the House of Representatives is the Speaker of the House. The party with the most seats in the US Senate, elects a "majority leader".
The 'leader' of the US House of Representatives is known as the Speaker of the House. The Speaker is elected by the Party (Democrat or Republican) that controls the most seats in the House, known as the majority party. The Speaker is also therefore, the majority leader. The Party with fewer seats in the House than the other Party is known as the minority party, and the minority party elects its own leader, known as the minority leader. The current Speaker and majority leader is John Boehner, a Republican.
As of October 2017 California representative Kevin McCarthy (R) is the majority leader in the U.S. House of Representatives.
The Speaker of the House is elected by the members of the House of Representatives. Before the vote each party chooses their candidate. The majority party's candidate will then win the election (assuming his or her party's representatives vote according to the party's decision).
Steny Hoyer of Maryland is the current Majority Floor Leader in the House of Representatives.
The lower house of Congress is the House of Representatives. The majority leader in this house is the Speaker of the House.
I believe the second ranking leader in the House is the majority leader.