His leadership in the new age of electronic media, the growth of executive agencies under the New Deal, his Brain Trust advisors, and the creation of the Executive Office of the President in 1939 led to a transformation of the presidency.
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As Chief of Staff, Regan was closely involved in the day to day management of White House policy, which led Howard Baker, Regan's successor as Chief of Staff, to give a rebuke that Regan was becoming a "Prime Minister" inside an increasingly complex Imperial Presidency.