The duties and responsibilities of the White House chief of staff vary from one administration to another and, in fact, there is no legal requirement that the president even fill the position. However, since at least 1979, all presidents have found the need for a chief of staff, who typically oversees the actions of the White House staff, manages the president's daily schedule, and decides who is allowed to meet with the president. Due to these core duties, the chief of staff has at various times been labeled "the president's gatekeeper".