<P> In the administration of Donald Trump, the current Chief of Staff is John F. Kelly, who succeeded Reince Priebus on July 31, 2017 . </P> <P> The duties of the White House chief of staff vary greatly 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 schedule, and decides who is allowed to meet with the president . Because of these duties, the chief of staff has at various times been labeled "The Gatekeeper", or "the power behind the throne". </P> <P> Originally, the duties now performed by the chief of staff belonged to the president's private secretary and were fulfilled by crucial confidants and advisers such as George B. Cortelyou, Joseph Tumulty, and Louis McHenry Howe to Presidents Theodore Roosevelt, Woodrow Wilson, and Franklin Roosevelt, respectively . The private secretary served as the president's de facto chief aide in a role that combined personal and professional assignments of highly delicate and demanding natures, requiring great skill and discretion . The job of gatekeeper and overseeing the president's schedule was separately delegated to the appointments secretary, as with FDR's aide Edwin "Pa" Watson . </P> <P> From 1933 to 1939, as he greatly expanded the scope of the federal government's policies and powers in response to the Great Depression, Roosevelt relied on his "Brain Trust" of top advisers . Although working directly for the president, they were often appointed to vacant positions in agencies and departments, whence they drew their salaries since the White House lacked statutory or budgetary authority to create new staff positions . It was not until 1939, during Franklin D. Roosevelt's second term in office, that the foundations of the modern White House staff were created using a formal structure . Roosevelt was able to get Congress to approve the creation of the Executive Office of the President, which would report directly to the president . During World War II, Roosevelt created the position of "Chief of Staff to the Commander in Chief" for his principal military adviser, William D. Leahy . </P>

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