Jeff Greenfield is a four-time Emmy Award-winning broadcast journalist. He is a veteran political, media and culture reporter, and has served as senior political correspondent at CBS News since May 2007. He contributes to the CBS Evening News, The Early Show, CBS News Sunday Morning and other CBS News broadcasts, as well as CBSNews.com. Prior to joining CBS he was a senior political analyst for CNN from 1998 to 2007; and a political and media analyst for ABC News, where he was a regular contributor to Nightline and ABC World News Sunday from 1983 to 1997. In addition, he is a bestselling author of both fiction and non-fiction books - including his 2011 release Then Everything Changed: Stunning Alternate Histories of American Politics – and has also written for such publications as Harper’s, National Lampoon, Politico, and the New York Times Magazine. Prior to becoming a member of the media, Greenfield worked in politics, including as a Senate aide and speechwriter for Robert F. Kennedy from 1967 to 1968.