Christopher also raced in NASCAR's Nextel Cup, Busch, and Craftsman Truck Series. He is best known for competing in NASCAR's Whelen Modified Tour, where he has over 40 victories and a championship in 2008. He is also well known for his success on the 1.058 mile New Hampshire Motor Speedway where Christopher has won five Camping World East Series events and 5 Whelen Modified Tour events.