L. Patrick Gray May 3, 1972 – April 27, 1973 359 days Acting Director of the FBI Richard Nixon — William Ruckelshaus.jpg William Ruckelshaus April 30, 1973 – July 9, 1973 70 days Acting Director of the FBI Richard Nixon 2 Clarence M. Kelley.jpg Clarence M. Kelley July 9, 1973 – February 15, 1978 4 years, 221 days Richard Nixon; Gerald Ford; Jimmy Carter — Jbadams.jpg James B. Adams February 15, 1978 – February 23, 1978 8 days Associate Director of the FBI; Acting Director Jimmy Carter 3 Williamwebster.jpg William H. Webster February 23, 1978 – May 25, 1987 9 years, 91 days Jimmy Carter; Ronald Reagan — Otto-lg.jpg John E. Otto May 26, 1987 – November 2, 1987 160 days Deputy Director of the FBI; Acting Director Ronald Reagan 4 William S. Sessions.jpg William S. Sessions November 2, 1987 – July 19, 1993 5 years, 259 days Ronald Reagan; George H.W. Bush; Bill Clinton — Clarke-lg.jpg Floyd I. Clarke July 19, 1993 – September 1, 1993 44 days Deputy Director of the FBI; Acting Director Bill Clinton 5 Louisfreeh.jpeg Louis Freeh September 1, 1993 – June 25, 2001 7 years, 297 days Bill Clinton ; George W. Bush — Pickard-lg.jpg Thomas J. Pickard June 25, 2001 – September 4, 2001 71 days Deputy Director of the FBI; Acting Director George W. Bush 6 Robert S. Mueller official portrait.jpg Robert Mueller September 4, 2001 – September 4, 2013 12 years, 0 days George W. Bush; Barack Obama

thats off the top of my head no wikipedia nope no siree