| Regimental number | 3439 |
| Place of birth | Beechwood Victoria |
| Religion | Roman Catholic |
| Occupation | Linesman |
| Address | 144 Cheshunt Street, Richmond, Victoria |
| Marital status | Single |
| Age at embarkation | 26 |
| Next of kin | Father, H W O'Brien, 144 Cheshunt Street, Richmond, Victoria |
| Enlistment date | 6 September 1916 |
| Date of enlistment from Nominal Roll | 21 August 1916 |
| Rank on enlistment | Private |
| Unit name | 53rd Battalion, 9th Reinforcement |
| AWM Embarkation Roll number | 23/70/4 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A68 Anchises on 24 January 1917 |
| Rank from Nominal Roll | Sapper |
| Unit from Nominal Roll | Australian Corps Signal Company |
| Fate | Returned to Australia 22 August 1919 |
| Date of death | 24 March 1932 |
| Place of burial | Rookwood Necropolis |
