Crennel, 66, didn't coach this season after he was fired as head coach of the Chiefs in 2012. He went 4-15 in Kansas City after taking over for Todd Haley, and he was 24-40 in four seasons as head coach of the Browns.
Crennel, who agreed to a three-year deal with Houston, had success in his last stint as a defensive coordinator, winning three Super Bowls in four seasons with the Patriots.
He takes over a Texans defense that was tied for 24th in the league with 26.8 points allowed per game.
Romeo Crennel has agreed to a 3yr deal as the Texans new defensive coordinator — Jason La Canfora (@JasonLaCanfora) January 20, 2014