| Regimental number | 472 |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Address | Menzies Street, Petrie Terrace, Brisbane, Queensland |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Father, Hugh O'Brien, Menzies Street Petrie Terrace, Brisbane, Queensland |
| Enlistment date | 19 September 1914 |
| Rank on enlistment | Private |
| Unit name | 15th Battalion, C Company |
| AWM Embarkation Roll number | 23/32/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A40 Ceramic on 22 December 1914 |
| Rank from Nominal Roll | Gunner |
| Unit from Nominal Roll | 11th Field Artillery Brigade |
| Fate | Returned to Australia 8 October 1918 |
