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'''David Gergen''', according to his web site, has served as a commentator, editor, teacher, public servant, best-selling author and adviser to presidents for 30 years."[http://www.davidgergen.com/biography.html]

Gergen served as "director of communications for President [[Ronald Reagan]] and held positions in the administrations of Presidents [[Richard M. Nixon]] and [[Gerald R. Ford]]. In 1993, he put his country before politics when he agreed to first serve as counselor to President [[William Jefferson Clinton]] on both foreign policy and domestic affairs, then as special international adviser to the president and to Secretary of State [[Warren Christopher]]."[http://www.davidgergen.com/biography.html]