Petersen is part of a sprawling tree of coaches who either have coached at Boise or have groomed coaches who have coached at Boise. You may recognize many of the other names. Dirk Koetter. Dan Hawkins. Harsin, of course. Mike Bellotti. Andy Avalos. The tree’s deepest roots even include a Super Bowl-winning coach, Andy Reid, and a pair of West Coast coaching legends: Victor Rowen and Jim Sochor.