With the sudden deaths of two high profile journalists, it’s been a whiplash week in the media world. 

New York Times media columnist David Carr died of a heart attack in the newsroom last night, while just 24 hours earlier, 60-Minutes correspondent Bob Simon was killed in a car crash.

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.