| Regimental number | 63403 |
| Occupation | Labourer |
| Next of kin | Father, Thomas O'Brien, Winton |
| Rank on embarkation | Private |
| Unit name | New Zealand Expeditionary Force, 32nd Reinforcements, E Company |
| Embarkation details | Unit embarked from Wellington on board HMNZT 96 Maunganui on |
| Sources | Nominal Roll Vol. 3: Roll 75, p. 38 |