| Regimental number | 26307 |
| Place of birth | Australia |
| Occupation | Sawmill hand |
| Next of kin | Brother, M J O'Brien, Prince of Wales Hotel, Tory Street, Wellington |
| Rank on embarkation | Private |
| Unit name | New Zealand Expeditionary Force, 17th Reinforcements, Canterbury Infantry Battalion, C Company |
| Embarkation details | Unit embarked from Wellington on board Pakeha on |
| Sources | Nominal Roll Vol. 2: Roll 41, p. 13 |