Career
O'Brien was a dangerous small forward (Height: 174 cm. Playing Weight: 89 kg) from Rye in Victoria. His style can be compared to current Swan Ryan O'Keefe, and he was a tough uncompromising in and under player.
In 1991, he was traded by Essendon to St Kilda. At the end of 1995, he was traded to the Swans. After several years at the Swans, O'Brien retired in 2000.
After his AFL career, O'Brien turned to coaching, where he took up a position with the Broadbeach Australian Football Club in Queensland.