It is important to note that the Rams have not confirmed the hiring of Cecil, however.
Cecil coached for ten years in Tennessee (2001-2010) under former Titans and new Rams head coach Jeff Fisher. Cecil served as the Titans defensive coordinator (2009-2010) after coaching the secondary there (2007-2008). His entire Titans' coaching resume is as follows, from titansonline.com:
2009-10: Defensive Coordinator, Tennessee Titans
2007-08: Secondary, Tennessee Titans
2004-06: Safeties and Nickel Backs, Tennessee Titans
2001-03: Defensive Assistant/Quality Control, Tennessee Titans
As secondary coach, the Titans defensive backs excelled.
In 2007, the Tennessee secondary produced 14 interceptions and the defense as a whole picked off 22 passes, ranking second in the NFL. Then rookie safety Michael Griffin and second-year cornerback Cortland Finnegan progressed nicely that year under Cecil.
In 2008, Cecil oversaw one of the best, if not the best, secondaries in the NFL, as three of four starters (Cortand Finnegan, Chris Hope, Michael Griffin) earned their first Pro Bowl berths. It was the first time in franchise history that three players from the secondary represented the team in the Pro Bowl. The defensive backfield gathered 19 interceptions, which ranked second in the NFL by a secondary.
As a player, Cecil was renowned as a hard-nosed, hard-hitting safety in a career that spanned from 1988 through 1995. Cecil played for the Green Bay Packers (1988-1992) and the then Phoenix Cardinals (1993-1995). Cecil was named by Pro Football Weekly to the 1992 NFC All Conference Team in 1992 and made the Pro Bowl following that season.
Cecil (like the previously mentioned fellow former defensive back Fisher) brings the same type of fire, intensity and toughness to his coaching career as he did to his playing career.
For the Rams, adding a defensive backs coach with two years of previous experience as a defensive coordinator under Fisher looks to be an exceptional hire. Cecil is obviously well versed in Fisher's coaching style and knows exactly what Fisher will expect from him and the defensive backs.