| Regimental number | 1961 |
| Place of birth | Sydney, New South Wales |
| School | Glen Innes Public School, New South Wales |
| Religion | Roman Catholic |
| Occupation | School teacher |
| Address | 89 Hurtle Square, Adelaide, South Australia |
| Marital status | Married |
| Age at embarkation | 24 |
| Next of kin | Wife, Mrs Mary Florence O'Brien, 89 Hurtle Square, Adelaide, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 27th Battalion, 3rd Reinforcement |
| AWM Embarkation Roll number | 23/44/2 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board RMS Morea on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 27th Battalion |
| Fate | Killed in Action |
| Place of death or wounding | Flers, France |
| Age at death | 25 |
| Age at death from cemetery records | 25 |
| Place of burial | A.I.F. Burial Ground, Grass Lane (Plot XI, Row B, Grave No. 9), Flers, France |
| Panel number, Roll of Honour, Australian War Memorial | 111 |
| Miscellaneous information from cemetery records | Parents: Michael and Cathrine O'BRIEN; husbnad of M.F. O'BRIEN, "Vrona", Mortlake Street, Concord, New South Wales |