| Regimental number | 3890 |
| Place of birth | Sydney, New South Wales |
| Religion | Roman Catholic |
| Occupation | Driver |
| Address | 15 Brook Street, North Sydney, New South Wales |
| Marital status | Married |
| Age at embarkation | 30 |
| Next of kin | Wife, Mrs I O'Brien, 15 Brook Street, North Sydney, New South Wales |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 19th Battalion, 9th Reinforcement |
| AWM Embarkation Roll number | 23/36/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A54 Runic on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 55th Battalion |
| Fate | Returned to Australia |
| Miscellaneous information from cemetery records | Photo: Peter Dennis. Parents: James and Mary Ann O'BRIEN |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
| Date of death | |
| Age at death | 54 |
| Place of burial | Macquarie Park Cemetery and Crematorium, North Ryde, New South Wales |
