According to ESPN.com's Jamison Hensley, Frazier will be the secondary coach in Baltimore.
Frazier became a free agent after the Tampa Bay Buccaneers made the surprising decision to fire head coach Lovie Smith after the 2015 season ended.
In addition to his two years in Tampa Bay, Frazier was the defensive coordinator for the Cincinnati Bengals and then the Minnesota Vikings. After Minnesota promoted him to head coach, he led a team that was quarterbacked by Christian Ponder to the playoffs in 2012.
With that type of resume and a spot as a former player on the 1985 Chicago Bears' historic defense, it's no surprise that Frazier was a hot commodity.
The Ravens can expect a boost to their defensive backfield, which finished tied for 22nd in touchdown passes allowed last season. The 56-year-old prefers to employ a Cover 2 system, which means the Ravens may begin to adjust their roster accordingly.
After a rough first year in Tampa Bay, Frazier's unit ranked 10th in yards allowed in 2015. Although the Bucs were 26th in scoring defense, some of the blame goes to the 28 giveaways Tampa's offense conceded.
One could argue Frazier didn't have enough time to prove himself in his Buccaneers stint, so the Ravens present a fresh opportunity that should have him eager to show his schematic prowess.
But the NFL is about immediate results, meaning Frazier will have to get his players to buy in quickly and trust a set of schemes some may consider to be antiquated. This may be the time for Frazier to revamp his approach and add some more exotic looks to his Cover 2-heavy arsenal.