| Regimental number | 1159 |
| Religion | Roman Catholic |
| Occupation | Mining prospector |
| Address | 30 Landale Street, Invermay, Launceston, Tasmania |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Father, J D O'Brien, 30 Landale Street, Invermay, Launceston, Tasmania |
| Enlistment date | 2 May 1915 |
| Rank on enlistment | Private |
| Unit name | 26th Battalion, D Company |
| AWM Embarkation Roll number | 23/43/1 |
| Embarkation details | Unit embarked from Brisbane, Queensland, on board HMAT A60 Aeneas on 29 June 1915 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 26th Battalion |
| Fate | Returned to Australia 3 January 1916 |
