Who is amateur Todd Sinnott, contending at Australian Open?

Todd Sinnott is playing among the world's best, staying within reach of the leaders with one round to play. But just who is this Australian Amateur? He hasn't recorded any major victories this year, but his three huge runner-up finishes and No. 53 position in the Golfweek/AmateurGolf.com World Rankings should give you some indication of his ability, if his Friday 4-under par round at Australian Golf Club wasn't enough already.