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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 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]].

In the White House the position was first introduced by [[President Eisenhower]] who brought the organizing principal with him from the [[Pentagon]] using the heirachial 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 principal with him from the [[Pentagon]] using the heirachial 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.