| Regimental number | 31837 |
| Place of birth | Upper Horton New South Wales |
| Religion | Roman Catholic |
| Occupation | Shop assistant |
| Address | Upper Harton, New South Wales |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Father, J O'Brien, Upper Harton, New South Wales |
| Enlistment date | |
| Rank on enlistment | Gunner |
| Unit name | Medium Trench Mortar Battery Reinforcement 5 |
| AWM Embarkation Roll number | 13/129/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A67 Orsova on |
| Rank from Nominal Roll | Driver |
| Unit from Nominal Roll | 4th Division Ammunition Column |
| Fate | Returned to Australia |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |