Singletary has no previous coaching experience, but last month was a finalist for the head coach position at his alma mater, Baylor.
The 44-year-old was known for his work ethic when it came to preparing for an opponent. He's worked as a motivational speaker since retiring.
Instead of having Brian Urlacher under his tutelage it will be Ray Lewis. The two are arguably the two best linebackers in the game, but it will be Lewis that will benefit from Singletary's knowledge.
The Ravens linebacker job opened up when Mike Smith left for Jacksonville and will join new head coach Jack Del Rio.
Singletary will join Brian Billick's staff and work directly under defensive coordinator Mike Nolan. Rex Ryan, son of former Bears defensive coordinator Buddy Ryan, is the defensive line coach.
The Ravens two years removed from winning the Super Bowl finished 7-9 largely because salary cap problems forced them to release several starters, while Lewis missed time due to shoulder surgery.
The Bears have yet to hire anyone as the defensive line coach, but Chuck Bullough is the frontrunner considering he's was Norris' assistant last season and has been with the team since 1999.