We learned this week that another big name in news is about to make an exit, but unlike Brian Williams, Jon Stewart is leaving voluntarily. For nearly two decades now, Stewart has been a walking contradiction: a comedian who makes fun of the news media while also becoming one of its most trusted names.

Dan Kennedy is an associate professor of journalism at Northeastern University.

Adam Reilly is a reporter for WGBH News. 

Joshua Benton is the director of the Nieman Journalism Lab at Harvard University.

Tom Fiedler is the dean of Boston University's College of Communication.