The CSU job became open when Jim McElwain left the Rams to become Florida's next head coach in early December. McElwain, who replaces Will Muschamp for the Gators, had been Colorado State's head coach since 2012.
Ohio State hired Ash before the 2014 season as co-defensive coordinator and safeties coach after he spent 2013 as Arkansas's defensive coordinator and secondary coach.
Ash followed Bret Bielema to Arkansas after both spent several years at Wisconsin. Ash was the Badgers' defensive coordinator and defensive backs coach from 2011-12 after serving solely as UW's defensive backs coach in 2010.
In addition to Ash, former USC associate head coach John Baxter also reportedly interviewed for the Colorado State job. Baxter was USC's special teams coach from 2010-13 but wasn't retained by head coach Steve Sarkisian after he took over in 2014.
Ohio State has had an up-and-down year defensively, coming in at 15th in the country in total defense with 328 yards allowed per game and 23rd in scoring defense with 21.2 points allowed per game. The Buckeyes are fourth in the nation with 21 interceptions on the season. Cornerback Doran Grant and defensive back Vonn Bell are tied for the team lead with five interceptions.
No. 4 Ohio State will play No. 1 Alabama in the Sugar Bowl on New Year's Day. As one of the two inaugural College Football Playoff semifinal games, the winner will play whomever advances from the Rose Bowl Game between No. 2 Oregon and No. 3 Florida State, also on New Year's Day.
- Mike Fiammetta