Allen (born September 22, 1972) is an American football coach who is the defensive coordinator for the New Orleans Saints of the National Football League (NFL).
He previously served as the head coach of the Oakland Raiders.
Allen also previously coached for the Denver Broncos, New Orleans Saints, Atlanta Falcons, University of Tulsa and his alma mater, Texas A&M University.
On September 29, 2014, Allen was fired as the Raiders head coach after an 0–4 start during the 2014 NFL season.
Retracted reports from a day earlier led to media speculation, but the decision was not final until the day after.
On November 16, 2015, Allen took over the defensive coordinator job for the New Orleans Saints after Rob Ryan was fired.
He was previously working with the Saints as a defensive assistant.