 He was named to the All-Tournament Team for the 2014 Elite City Sevens Tournament and scored four tries in the 2014 World Club 7s Tournament at Twickenham Stadium as Seattle won the Shield.Cullen was a USA Rugby Collegiate All American at Utah and toured New Zealand with the 2013 Men's Collegiate All-Americans.Before transitioning to rugby, Cullen was a second-team all-Pac-12 conference left tackle who started 24 games in two seasons for Utah.