The list of DCIs, in chronological order:

  1. Sidney W. Souers (1946)
  2. Hoyt S. Vandenberg (1946-1947)
  3. Roscoe H. Hillenkoetter (1947-1950)
  4. Walter B. Smith (1950-1953)
  5. Allen W. Dulles (1953-1961)
  6. John A. McCone (1961-1965)
  7. William F. Raborn, Jr. (1965-1966)
  8. Richard M. Helms (1966-1973)
  9. James R. Schlesinger (1973)
  10. William E. Colby (1973-1976)
  11. George Bush (1976-1977)
  12. Stansfield Turner (1977-1981)
  13. William Casey (1981-1987)
  14. William H. Webster (1987-1991)
  15. Robert M. Gates (1991-1993)
  16. R. James Woolsey (1993-1995)
  17. John M. Deutch (1995-1996)
  18. George J. Tenet (1997-2004)
  19. John E. McLaughlin (2004)
  20. Porter J. Goss (2004-)

As of April 20, 2005, the DCI is no longer the head of the Central Intelligence Community, and no longer advisor to the President and National Security Council. This position is now filled by the Director of National Intelligence.

Sources:
http://en.wikipedia.org/wiki/Director_of_the_Central_Intelligence_Agency