His biggest successes though, have come at home on the PGA Tour of Australasia, where he won the Order of Merit as the leading money winner in 2006.

The win brought to an end a seven-year drought for O'Hern, and propelled him to the top of the PGA Tour of Australasia's Order of Merit for 2006.

[3] He has won five tournaments in Australia, and continues to play on the PGA Tour of Australasia during the northern hemisphere winter.

O'Hern has featured in the top 20 of the Official World Golf Rankings, and he is the only player who has beaten Tiger Woods in matchplay more than once.

He is coached by Neil Simpson of the Mount Lawley Golf Club in Perth, Western Australia.

O'Hern satisfied his medical exemption in May 2011 with four events remaining to retain his PGA Tour status.