Ohio State is losing one defensive assistant heading into 2021, head coach Ryan Day announced Friday morning.

During his virtual press conference to recap the 2020 season, Day announced that co-defensive coordinator Greg Mattison is retiring following the 2020 season. Mattison served alongside co-DC Jeff Hafley in 2019 and DC Kerry Coombs in 2020.

Day thanked Mattison for his service to the Buckeyes and wished him well heading into retirement. Mattison is 71-years-old.

Here are Day’s comments:

Mattison is one of the few coaches to experience the Michigan-Ohio State rivalry from both sides of the ball. He served on Michigan’s staff from 2011-18 before joining Day’s first Ohio State staff in 2019.

Mattison’s coaching career stretches all the way back to the 1970s, and he has seen stints at the high school, NFL, and collegiate levels. He joins long-time Northwestern DC Mike Hankwitz as long-time coaches to retire following the tumultuous 2020 season.

Best of luck to Mattison as he heads into his retirement. Hopefully Day and company find the best possible replacement for 2021 and beyond.