The NFL front office is not much different than the locker room in some ways. Usually, just because you've had past success as an NFL executive does not mean you are guaranteed a longer period of stay. It's a "what have you done for me lately" league, and fans will always want someone held accountable.
A lot of NFL general managers have already been axed this offseason. The Browns, Buccaneers and Dolphins were all teams that ousted their GMs after underwhelming seasons. Who might be on a tight leash in 2014?
Again, just because you've had success in previous seasons does not mean you are guaranteed job security for years to come. These four NFL GMs will likely feel the heat in 2014 if their teams do not show improvement.