| Regimental number | 7770 |
| Religion | Roman Catholic |
| Occupation | Grainer |
| Address | Croydon, New South Wales |
| Marital status | Single |
| Age at embarkation | 20 |
| Next of kin | Father, Mr. D. O'Brien, 6 Railway Parade, Croydon, New South Wales |
| Enlistment date | 29 September 1917 |
| Rank on enlistment | Private |
| Unit name | 1st Battalion, 26th Reinforcement |
| AWM Embarkation Roll number | 23/18/5 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A38 Ulysses on 19 December 1917 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 1st Battalion |
| Fate | Returned to Australia 21 December 1918 |
| Date of death | 2 August 1963 |
| Place of burial | Rookwood Crematorium |
