James Farrior is one of the great defensive players in recent Pittsburgh Steelers history, originally signing in free agency with the team in 2002, and playing there for the next decade. He helped bring them to three Super Bowls, winning two, and being a decorated inside linebacker in an era dominated by the likes of Ray Lewis.
The interesting thing about his career is that it was evenly divided between the tail end of the Bill Cowher era and the first phase of the Mike Tomlin era. He played under Cowher from 2001 through the 2006 season, and then under Tomlin when he came in beginning in 2007 and up through his retirement at the end of the 2011 season.