Serial number Name Presidents assisted during the term 1 Stephen Early 1949-1950 Harry Truman 2 Robert Lovett 1950-1951 Harry Truman 3 Roger Case 1953–1954 Dwight· Eisenhower 4 Robert Bernard Anderson 1954–1955 Dwight Eisenhower 5 Donald Quartz 1955–1959 Dwight Eisenhower 6 Thomas Gates 1959 Dwight Eisenhower 7 James Douglas 1959–1961 Dwight Eisenhower 8 Roswell Gilpatrick 1961–1964 John F. Kennedy, Lyndon Johnson 9 Cyrus Vance 1964–1967 Lyndon Johnson 10 Paul Nietzsche 1967–1969 Lyndon Johnson 11 David Packard 1969–1971 Richard Nixon 12 Bill Clements 1971–1977 Richard Nixon, Gerald Ford 13 Charles Duncan 1977–1979 Jimmy Carter 14 W. Graham Clayter 1979 –1981 Jimmy Carter 15 Frank Carlucci 1981–1983 Ronald Reagan 16 W. Paul Thayer 1983–1984 Ronald Reagan 17 William Taft 1984–1989 Ronald Reagan 18 Donald · Atwood 1989–1993 George Herbert Walker Bush 19 William Perry 1993–1994 Bill Clinton 20 John Deutsch 1994–1995 Bill Clinton 21 John White 1995–1997 Bill Clinton 22 John Hamer 1997–2000 Bill Clinton 23 Rudy Leone 2000–2001 Bill Clinton 24 Paul Wolfowitz 2001–2005 George Walker Bush 25 Gordon England 2005–2009 George Walker· Bush 26 William Lynn 2009-2011 Barack Obama 27 Ashton Carter 2011-2013 Barack Obama 28 Robert Walker 2014-Barack Obama