Before joining "The New Republic" in 1997, Cohn served as executive editor at "The American Prospect". Cohn has also written for the "Boston Globe", "Mother Jones", "The New York Times", "Newsweek", "Rolling Stone", "Slate" and the "Washington Post". He has been a media fellow at the Henry J. Kaiser Family Foundation. and a senior fellow at Demos, and is a member of the National Academy of Social Insurance. He has appeared on television and radio shows, including MSNBC's "Countdown," NPR's "Fresh Air," and "The Colbert Report".