When most people talk about NFL coaching trees, they talk about Bill Walsh and Bill Parcells. But the Ravens have an impressive coaching tree as well. Some of these coaches may not have started their NFL coaching career with us but received a head coaching position only after leaving us (not before which excludes coaches like Caldwell who was a head coach before getting here). The Raven's Coaching Tree consist of: Jack Del Rio, Hue Jackson, Marvin Lewis*, Eric Mangini*, Mike Nolan, Chuck Pagano, Mike Pettine, Rex Ryan, Jim Schwartz*, Mike Singletary, Mike Simth, and Ken Whisenhunt*.
I could be missing one or two but that's a pretty long list for a franchise that's only been in existence for 18 years, right?
* May be counted under another coaching tree. For ex., Mangini can technically be counted under the Belichick coaching tree.