| Regimental number | 6072 |
| Place of birth | Windsor, New South Wales |
| Religion | Church of England |
| Occupation | Labourer |
| Address | 117 Wells Street, Redfern, New South Wales |
| Marital status | Single |
| Age at embarkation | 22 |
| Next of kin | Father, John Michael O'Brien, George Street, Windsor, New South Wales |
| Previous military service | Served in 41st Infantry Batallion, Citizen Military Forces. |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 21st Battalion, 17th Reinforcement |
| AWM Embarkation Roll number | 23/38/3 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A19 Afric on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 21st Battalion |
| Other details from Roll of Honour Circular | Enlisted on 29th August 1916 and joined the 21st Batallion on 13th May 1917. |
| Fate | Killed in Action |
| Place of death or wounding | Broodseinde Ridge, Passchendaele, Belgium |
| Age at death | 23 |
| Place of burial | Buttes New British Cemetery (Plot XXVIII, Row A, Grave No. 16), Polygon Wood, Zonnebeke, Belgium |
| Panel number, Roll of Honour, Australian War Memorial | 94 |
| Miscellaneous information from cemetery records | Photo: Andrew Richardson |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
