Gergen, David: - David Gergen has been a leader in the public arena for more than half a century. He has served as a White House adviser to four US presidents of both parties: Nixon, Ford, Reagan, and Clinton. Gergen then served as the editor of US News & World Report. For the past two decades, he has served as a professor of public service and founding director of the Center for Public Leadership at the Harvard Kennedy School. He is also a senior political analyst for CNN where he is a respected voice in national and international affairs.