Mattison joined the Polar Bear coaching staff in the summer of 2010 and assumed coaching duties for the safeties. He oversaw a unit that ranked fifth in the NESCAC in pass defense last fall and tied for third in the league with 10 interceptions.

A 2003 graduate of Boston College, Mattison was a walk-on for the Eagles and a two-time Scout Team Player of the Year, eventually earning a full athletic scholarship and two varsity letters by the time he left. After coaching stints at Assumption College and Holy Cross, Mattison returned to Boston College. Hired as a graduate assistant for recruiting, Mattison was promoted to a graduate assistant for the offense in his second year, where he assisted with coaching the offensive line and tight ends. Mattison has a Marketing degree and a master's in Administrative Studies from Boston College.