Dennis J. Allenis an American football coach who is the defensive coordinator for the New Orleans Saints of the National Football League. He previously served as the head coach of the Oakland Raiders, but was fired after an 0–4 start during the 2014 NFL season. Allen also previously coached for the Denver Broncos, New Orleans Saints, Atlanta Falcons, University of Tulsa and his alma mater, Texas A&M University...
(wikipedia)