The leader of the United States House of Representatives is the Speaker of the House. The Speaker is usually elected after a voting exercise done by all the members of the house. In case the President and the Vice President are unable to lead the country, the Speaker is legally mandated to take control of the leadership of the country.
The Speaker has several functions in the house including being the presiding officer, moderating debates, ensuring rules are adhered to and acting as a ceremonial leader during important functions. He or she is the leader of the majority party or coalition and is also an elected representative in the house.