US Chief of Staff
The White House Chief of Staff is the highest-ranking member of the cabinet and a senior aide to the President.1 Some individuals who have held the position have been called the 'Second-Most Powerful Man in Washington' because of the nature of the job.1 The Current US Chief of Staff is Rahn Enabuel.1 He has served in this position since January 20, 2009 when President Barack Obama was inaugurated.1
The duties of the Chief of staff are managerial and advisory.1 They select key White House staff and supervise the, control the flow of people in the Oval Office, manage the President's schedule, manage the flow of information, protect the interests of the President, and negotiate with Congress.1 These duties use to be carried out by the Assistant to the President, which was created in 1946, but the title was changed in 1961.1 The Chief of Staff is assisted by one or more Deputy White House Chiefs of Staff.1
The former Chief of Staff to President George W. Bush was Joshua Bolton.1 The first was John R. Steelman under Harry Truman.1