Debut: Round 3, 1931 vs Essendon, aged 22 years, 2 days
Carlton Player No. 479
Last game: Round 17, 1931 vs Footscray, aged 22 years, 114 days
Guernsey No. 25
DOB: 14 May, 1909
Wearing guernsey #25, O'Brien played 12 games for Carlton commencing in 1931. O'Brien kicked 7 goals in his 12 games, and stood at 169cm in height.
O'Brien was picked up from Footscray (he originally played for Railways), where he had played over Seasons 1929 and 1930. Footscray was where O'Brien returned after his brief stint at Princes Park, racking up a further 70 games from 1933 to 1938.
In total O'Brien amassed 100 VFL games and booted 124 goals whilst playing with Carlton and Footscray. His combined total for his two stints at Footscray was 88 games and 117 goals. He played a single game (round 2) of the 1938 season to reach his 100th game.
O'Brien passed away on the 9th January, 1955 aged 45.