| Regimental number | 72 |
| Date of birth | |
| Place of birth | Darlington, Sydney |
| School | Christian Brothers, Petersham |
| Religion | Roman Catholic |
| Occupation | Cordialmaker |
| Address | 48 Railway Street, Petersham, New South Wales |
| Marital status | Single |
| Age at embarkation | 19 |
| Next of kin | Denis O'Brien, 48 Railway Street, Petersham, New South Wales |
| Previous military service | 17th Signal Troop Army Engineers |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Sapper |
| Unit name | Divisional Signal Company 1 |
| AWM Embarkation Roll number | 22/11/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A10 Karroo on |
| Rank from Nominal Roll | Sergeant |
| Unit from Nominal Roll | 1st Divisional Signal Company |
| Recommendations (Medals and Awards) |
Mention in Despatches 'Valuable services and devotion to duty at Pozieres.' Military Medal 'Excellent work from September 1916 to February 1917. Conspicuous gallantry and devotion to duty as linesman and Non Commissioned Officer.' Recommendation date: Meritorious Service Medal Recommendation date: Mention in Despatches Awarded, and promulgated, 'London Gazette', Second Supplement, No. 30107 (1 June 1917); 'Commonwealth Gazette' No. 169 (4 October 1917). Recommendation date: Distinguished Conduct Medal Recommendation date: |
| Fate | Returned to Australia |
| Medals |
Military Medal Source: 'Commonwealth Gazette' No. 189 Date: |
| Family/military connections | Father [?]: 4521 Corporal John O'BRIEN, 5th Field Butchery, returned to Australia, 28 March 1919. |
| Date of death | |
| Age at death | 66 |
| Place of burial | Frenchs Forest Cemetery, Roman Catholic D/44 |