| Regimental number | 3100 |
| Religion | Roman Catholic |
| Occupation | Salesman |
| Address | Randwick, New South Wales |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Father, John Joseph O'Brien, 'Hillcrest', King Street, Randwick, Sydney, New South Wales |
| Enlistment date | 6 November 1916 |
| Rank on enlistment | Private |
| Unit name | 35th Battalion, 7th Reinforcement |
| AWM Embarkation Roll number | 23/52/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A68 Anchises on 24 January 1917 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 35th Battalion |
| Fate | Returned to Australia 11 May 1919 |
| Date of death | 17 May 1965 |
| Place of burial | Macquarie Park Cemetery |
