From 2000 to 2003, Ryan was the linebackers coach for the New England Patriots.[1] In 2003, the Patriots ranked first in the NFL in fewest points allowed 238 while ranking seventh overall in the NFL in total defense. Ryan's unit also contributed to one of the best scoring defenses in franchise history in 2001, as the Patriots allowed just 17 points per game and produced Pro Bowlers Willie McGinest and Tedy Bruschi. However, as the actual Defensive Coodinator, Ryan's defenses have not accomplished postseason success and have regressed since 2004.
From 2004 to 2008, Ryan was the defensive coordinator for the Oakland Raiders.[1] In 2006, the Raiders ranked third in yards allowed per game and eighteenth in points allowed per game.
Former Cleveland Browns head coach Eric Mangini named Ryan as defensive coordinator on January 14, 2009.
He was officially named the Dallas Cowboys defensive coordinator on January 19, 2011.[3] The Cowboys missed the playoffs again in 2011 and were mediocre on defense, ranking 14th in yards allowed per game and 16th in points allowed per game. The 2012 season was more of the same. Dallas was ranked 14th in yards allowed per game and 23rd in points allowed per game while only ranking 16th in QB sacks. Dallas did not make the playoffs yet again. On January 8, 2013, the Cowboys ended Ryan's employment with the franchise.[4] In February 2013, Rob Ryan was hired as the New Orleans defensive coordinator. He will implement a 3–4 defense to the team, scrapping their current 4–3 defensive scheme.[5][6]