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'''Chief of staff''' is an important adviser, aide, or coordinator for an office holder. The chief of staff is often the highest-ranking staff member or senior aide.<ref>In many administration's for example, sometimes the [[National Security Advisor]] has outranked the Chief of staff, answering to the president alone. In others, the National Security Advisor must go through the Chief of staff to gain access to the president.</ref> It is used in [[the Pentagon]], [[the White House]], and by members of [[Congress]].

'''Chief of staff''' is an important adviser, aide, or coordinator for an office holder. The chief of staff is often the highest-ranking staff member or senior aide.<ref>In many administrations, for example, sometimes the [[National Security Advisor]] has outranked the Chief of Staff, answering to the president alone. In others, the National Security Advisor must go through the Chief of Staff to gain access to the president.</ref> It is used in [[the Pentagon]], [[the White House]], and by members of [[Congress]]. The White House Chief of Staff can be the most influential person in the entire [[Cabinet]] due to her daily communications with the President, and control over staffing decisions.

In the White House, the position was first introduced by [[President Eisenhower]] who brought the organizing principle with him from the [[Pentagon]] using the hierarchical structure in the branches of the military, and has been used by subsequent presidents ever since.<ref>There is no law mandating a president use this structure. Each president is free to organize his operation of the White House as he sees fit.</ref> Members of Congress and Committees have also adopted the organizing model for their own congressional staffs.

In the White House, the position was first introduced by [[President Eisenhower]] who brought the organizing principle with him from the [[Pentagon]] using the hierarchical structure in the branches of the military, and has been used by subsequent presidents ever since.<ref>There is no law mandating a president use this structure. Each president is free to organize his operation of the White House as he sees fit.</ref> Members of Congress and Committees have also adopted the organizing model for their own congressional staffs.

In the military, at the summit of the Army, Navy, and Air Force chiefs and the Marine commandant are the [[Joint Chiefs of Staff]].  

In the military, at the summit of the Army, Navy, and Air Force chiefs and the Marine Corps commandant are the [[Joint Chiefs of Staff]].  

In the White House, the position is appointed by the president and serves on his behalf, conducting day-to-day duties such as managing the president's schedule, hiring staff members, filling other key positions throughout the administration, limiting access to the president, and coordinating legislative proposals and votes with congressional party leaders and committee chairmen for the president's legislative agenda.

In the White House, the position is appointed by the president and serves on his behalf, conducting day-to-day duties such as managing the president's schedule, hiring staff members, filling other key positions throughout the administration, limiting access to the president, and coordinating legislative proposals and votes with congressional party leaders and committee chairmen for the president's legislative agenda.