| Regimental number | 1895 |
| Place of birth | Bingara New South Wales |
| Religion | Roman Catholic |
| Occupation | Bush worker |
| Address | Upper Horton, New South Wales |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, John Bede O'Brien, Upper Horton, New South Wales |
| Enlistment date | 12 January 1916 |
| Rank on enlistment | Private |
| Unit name | 33rd Battalion, 2nd Reinforcement |
| AWM Embarkation Roll number | 23/50/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A15 Port Sydney on 4 September 1916 |
| Rank from Nominal Roll | Corporal |
| Unit from Nominal Roll | 33rd Battalion |
| Fate | Returned to Australia 8 January 1919 |
