Harrison has volunteered to teach about football and his faith. He was the co-president of the Fellowship of Christian Athletes at Stanford University, where he performed public service outreach.
He was also a mentor and role model for disadvantaged youths emphasizing development and academic achievement through art projects for the Mural Music & Arts Project in East Palo Alto, CA.
His favorite faith teaching experience was through the Christ for the City International in El Salvador. He was a mission worker with an Omaha youth group, which helped set up sports activities for the children in several villages in the name of Christ.