He was born abroad, yes. But he is now an English referee in such much that he is registered with the FA. He wasn't brought to England because of his refereeing, rather he chose to relocate to England, I believe because he had signed up for a PhD at Liverpool University. As James has rightly said, when you transfer from England you are placed at an appropriate level, and as a FIFA official and the top referee on the A-League it was decided to put him at SG2. He didn't get promoted to SG2, that was his first assigned level after moving to England. And he stopped working games in Australia because it would have been a bloody long commute, not because he had been promoted to SG2