Defensive coordinator for the Dallas Cowboys, Atlanta Falcons and Cincinnati Bengals from 2000 to 2013; took over as head coach of the Minnesota Vikings in 2014.
He was a standout football player, baseball player, and wrestler at Lockport Township High School in Lockport, Illinois.
In his six seasons as defensive coordinator for the Bengals, from 2008 to 2013, he was able to turn the team's defense into one of the NFL's elite units. The team made the AFC playoffs in each of his last three years with the team.
He had three children, Adam, Corri, and Marki, with his wife Vikki, who died unexpectedly in October of 2009.
He was brought in to coach the Vikings a few weeks after the team fired Leslie Frazier, who could only muster 5 wins out of the Vikings in his final season with the team.