Career: 1971 - 1972
Debut: Round 16, 1971 v St Kilda, aged 20 years, 215 days
Carlton Player No. 831
Games: 2
Goals: Nil
Last game: Round 12, 1972 v Fitzroy, aged 21 years, 193 days
Guernsey No. 29
Height: 187 cm
Weight: 83 kg
DOB: December 14, 1950
O'Brien who was recruited from Echuca, played 2 games for Carlton after debuting in 1971 wearing Guernsey 29. O'Brien headed to VFA club Port Melbourne for the 1973 season with team-mate Peter Warbuton that was being coached by Ex-Blue defender Ian Collins.