Director of the Federal Bureau of Investigation
Directors are appointed by the President of the United States and confirmed by the Senate. In theory, they serve ten-year terms unless they resign, die, or are let go. In reality, none have served a full ten years, except J. Edgar Hoover and Robert Mueller. They both served longer than ten years. J. Edgar Hoover was appointed by Calvin Coolidge to the office in 1924. He was by far the longest-serving director. Hoover held the position from its establishment under the current title in 1935 until his death in 1972 because there was then no law limiting service time. In response to Hoover's lengthy tenure, Congress imposed a term limit of ten years (waived by the Senate for Robert Mueller on July 27, 2011). The current FBI director is Christopher A. Wray, who assumed his position on August 2, 2017.