| Regimental number | 2641 |
| Place of birth | Amby Queensland |
| Religion | Roman Catholic |
| Occupation | Stockman |
| Address | Amby, Queensland |
| Marital status | Single |
| Age at embarkation | 28 |
| Next of kin | Father, John Paul O'Brien, Amby, Queensland |
| Enlistment date | 20 February 1915 |
| Rank on enlistment | Driver |
| Unit name | 4th Light Horse Field Ambulance |
| Embarkation details | Unit embarked from on board HMAT A30 Borda on 16 June 1915 |
| Rank from Nominal Roll | Lance Corporal |
| Unit from Nominal Roll | 15th Field Company Engineers |
| Fate | Returned to Australia 5 April 1919 |
