The Majority Leader is elected in a party caucus of the majority ruling party. His primary function, aside from being the spokesman of the majority party, is to direct the deliberations on the floor.
In the present set-up of the House, the Majority Leader is concurrently the Chairman of the Committee on Rules. As such, all matters relevant to the Rules of the House, specifically the calendar of bills, preparation of Order of Business and Calendar of Business are within his responsibilities.