| Regimental number | 10/1937 |
| Address | Tokomaru Bay |
| Marital status | Single |
| Next of kin | Father, Patrick O'Brien, 63 Nelson Street, Auckland |
| Rank on embarkation | Private |
| Enlistment status | Volunteer |
| Unit name | New Zealand Expeditionary Force, 4th Reinforcements, Wellington Infantry Battalion |
| Embarkation details | Unit embarked from Wellington on |
| The 4th Reinforcements, Wellington Infantry Battalion, left New Zealand on board three ships (HMNZT 21 'Willochra', HMNZT 22 'Knight Templar', and HMNZT 23 'Waitomo'). It is not possible from the Nominal Roll to determine on which ship an individual embarked. | |
| Final rank | Private |
| Final unit | 1st Battalion, Wellington Infantry Regiment |
| Fate | Killed in Action |
| Place of burial | No known grave |
| Commemoration details | Messines Ridge (New Zealand) Memorial, nr Ieper, Belgium |
| Miscellaneous information from cemetery records | Father: Patrick O'Brien, Ponsonby, Auckland |
| Other details |
Medals: 1914-15 Star, British War Medal, Victory Medal |
| Miscellaneous details | Nominal Roll Vol. 1: Wellington Infantry Batln/Fourth |