DOB: 22 March 1969
Debut: Round 4, 1996 against Carlton at Princes Park,
Last Game: Round 22, 1997 against Fremantle at MCG
From: Collie/West Perth, Selection #60 1995 National Draft
Number: 38 (1996-1997)
Honours
Best First Year Player - 1996
Games: 24
Goals: 9
Career Statistics
| Wins | Draws | Losses | Winning % |
| 5 | 0 | 19 | 20.83 |
After eight seasons in the WAFL, O'Brien was picked up by Melbourne at the end of 1995 after playing in West Perth's premiership side. A year earlier he'd been the West Perth best and fairest winner. At 27-years-old, he is the oldest player to make his VFL/AFL debut for Melbourne since World War II. He had also been approached by Geelong before the draft, but Melbourne took him first.
O'Brien's ((Round 4 1996|first appearance) came as the result of a late change, but he established a spot, played 13 games, and he was named Best First Year Player. After his successful rookie year, the long kicking centreman and tagger couldn't find a permanent role in the side in 1997. His season was further affected by a month out with a knee injury and O'Brien was delisted at the end of the year.
After nominating for the national draft but not being selected O'Brien returned to West Perth in 1998 and played his last season of senior football there.
| Year | Games | Goals | Brownlow |
| 1996 | 13 | 7 | 0 |
| 1997 | 11 | 2 | 0 |
Lists
Interstate recruits
WAFL
Media
Age - 09/12/1995, 16/10/1997, 24/10/1997
Westside Football - 07/03/1996
Demon - December 1996
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