• Jan. 19: Ohio State hires Bill O’Brien — who spent 2023 as the offensive coordinator and quarterbacks coach with the New England Patriots — to the same roles in Columbus.

• Jan. 31: Boston College head coach Jeff Hafley leaves the Eagles to become the defensive coordinator of the Green Bay Packers.

• Feb. 9: Just three weeks after being hired by the Buckeyes, O’Brien is hired as Hafley’s replacement.

• Feb. 9: Ryan Day hires Kelly — a longtime friend and former assistant coach of Day’s at New Hampshire — away from UCLA to lead the Buckeyes’ offense.

• Feb. 12: UCLA hires Foster, a former star player and assistant coach for the Bruins, as its head coach. Foster recently took a job as the running backs coach with the Las Vegas Raiders but opted to return to his alma mater in light of its opening.

Foster will be the ninth active Power 4 head coach to lead his alma mater. Here are the others:

• Brent Key — Georgia Tech, hired 2023 • Kenny Dillingham — Arizona State (didn’t play CFB), hired 2023

• Jeff Brohm — Louisville, hired 2023

• Mario Cristobal — Miami, hired 2022 • Clark Lea — Vanderbilt, hired 2021

• Kalani Sitake — BYU, hired 2015 • Kirby Smart — Georgia, hired 2015 • Mike Gundy — Oklahoma State, hired 2005