Per CSNPhilly, the Eagles and Chip Kelly have hired Billy Davis to be the teams defensive coordinator.
Billy Davis will be the Eagles' new DC, per source
— Geoff Mosher (@GeoffMosherNFL) February 7, 2013
I know, everyone wants to know who Billy Davis is. Davis has been a coordinator with the 49ers and Cardinals at different times, and was recently the Browns linebackers coach.
Davis has a 3-4 background and looks like the Eagles will be switching defenses.