On November 24, 2009, Campbell withdrew his verbal intent to play Division 1 hockey for the University of Michigan Wolverines in order to qualify to play in the OHL. By the conclusion of his two seasons with the NTDP, Campbell had set a new franchise record for lowest goals-against average and most shutouts in a career. He also earned a gold medal for Team USA at the 2009 IIHF World U18 Championships and 2010 IIHF World U18 Championships. As a result, Campbell was drafted 11th overall by the Dallas Stars in the 2010 NHL Entry Draft. Campbell was also chosen in the seventh round (170th overall) by Dinamo Minsk in the 2010 Kontinental Hockey League Junior Draft.