He was the team's linebackers coach, a job he got in part due to his relationship with John Harbaugh. During his time at WMU, Mattison coached alongside John Harbaugh, who was a graduate assistant and assistant coach.
He was the team's linebackers coach, a position he obtained partly due to his connection with John Harbaugh. During his time at WMU, Mattison coached alongside John Harbaugh, who was a graduate assistant and assistant coach.