STATE COLLEGE, Pa. — Ted Roof is the new defensive coordinator at Penn State.

Replacing Tom Bradley, Roof will leave Central Florida after a month to take over the same position with the Nittany Lions under new coach Bill O'Brien, the school announced on Friday.

Roof was named Central Florida's defensive coordinator Dec. 8 after leaving Auburn following the regular season. He previously spent three seasons as the Tigers' defensive coordinator, including the 2010 national championship season. Auburn was ninth in the country in rushing defense that year.

O'Brien also hired John Butler to coach the secondary. Butler was on staff at Auburn and South Carolina the past two seasons, respectively.

Bradley, the veteran assistant under former coach Joe Paterno, posted on his Twitter account that he finished packing up his office late Thursday: "Walked out the doors proud with a lot of great memories and friends and a better man."