Crennel played baseball and football at Fort Knox (Ky.) High School and Central (Va.) High School before committing to college football at Western Kentucky. Although he was a four-year starter as a defensive lineman, he became an offensive lineman during his senior season at the request of the coaching staff. He was named the team MVP after the switch but was not drafted and never played in the NFL. During his career he wore size 67" 30" pants and he weighed 320 pounds.
Coaching career
College
After one season as a graduate assistant with Western Kentucky (1970), Crennel served as the defensive line coach for three seasons (1971-1974). He then became an assistant for defensive coordinator Bill Parcells and head coach Steve Sloan at Texas Tech for three seasons (1975-1977). Crennel finished his collegiate career with two seasons as the defensive ends coach for Mississippi (1978-1979) and one season as the defensive line coach for Georgia Tech (1980).
National Football League
Assistant coach
After spending two seasons as an assistant with the New York Giants, Crennel became the special teams coach for seven seasons (1983-1989) and the defensive line coach for three seasons (1990-1992). In 1983, he was reunited with Parcells as the head coach.
When Parcells stepped down as Giants head coach after Super Bowl XXV, Crennel stayed with the team under the two year tenure of Ray Handley. Crennel left the Giants after the 1992 season and worked as the defensive line coach for the New England Patriots for four seasons (1993-1996) and for the New York Jets for three seasons (1997-1999) during the time that Parcells was the head coach in each franchise.
Crennel was hired as the Cleveland Browns' defensive coordinator for the 2000 season before filling the same role with the Patriots for four seasons (2001-2004).
Crennel went 6-10 and 4-12 in his first two seasons with the Browns, finishing last in the AFC North and missing the playoffs each year. The Browns finished the 2007 season with a 10-6 record, just falling short of making the playoffs. Crennel's success in the 2007 season has led to talk by Brown's general manager, Phil Savage, of extending his contract as head coach.[2] The talks were productive and led the Browns to re-sign Crennel for two more years..
2008 Season
Crennel has led the Browns to a 1-3 record to start the 2008 season. He has been heavily criticized by fans and media for his apparent lack of interest and emotion on the sideline during games.
Assistant coaches under Romeo Crennel who became head coaches in the NFL:
None
Miscellany
Crennel earned a bachelor’s degree in physical education from Western Kentucky, and then a master’s degree while serving as a graduate assistant for the school in 1970.