David Eisenbach, PhD. teaches presidential history at Columbia University. He is an award winning author of three books including his latest One Nation Under Sex: How the Private Lives of Presidents, First Ladies and Their Lovers Changed the Course of American History. He was the host, writer and producer of the HISTORY special The Beltway Unbuckled and season 1 of 10 Things You Don't Know About. He also ran as a candidate for The Public Advocate of New York City.