Brett Metcalfe is originally from Australia, but has been racing AMA Supercross and Motocross in the USA for a decade now. He races on the Yoshimura backed RMZ 450 Suzuki.
AMA Supercross Series results – http://www.supercross.com/ama-supercross-race-results
World MX GP results – http://www.supercross.com/fim-world-motocross-race-results
AMA National Motocross results – http://www.supercross.com/ama-motocross-race-results