Bob Lloyd Schieffer (born February 25, 1937) is an American television journalist. He is known for his moderation of presidential debates, where he has been praised for his capability. Schieffer is one of the few journalists to have covered all four of the major Washington national assignments: the White House, the Pentagon, United States Department of State, and United States Congress. His career with CBS has almost exclusively dealt with national politics. He has interviewed every United States President since Richard Nixon, as well as most of those who sought the office.Schieffer has been with CBS News since 1969, serving as the anchor on the Saturday edition of CBS Evening News for 20 years, from 1976 to 1996, as well as the Chief Washington Correspondent from 1982 until 2015, and moderator of the Sunday public affairs show, Face the Nation, from 1991 until May 31, 2015.