| Regimental number | 4443 |
| Place of birth | Fremantle, Western Australia |
| School | Fremantle State School, Western Australia |
| Religion | Methodist |
| Occupation | Driller |
| Address | 23 Henderson Street, Fremantle, Western Australia |
| Marital status | Single |
| Age at embarkation | 18 |
| Next of kin | Father, W O'Brien, 23 Henderson Street, Fremantle, Western Australia |
| Previous military service | Served as a Leading Seaman in the Royal Australian Naval Brigade. |
| Enlistment date | |
| Rank on enlistment | Private |
| Unit name | 2nd Pioneer Battalion, Reinforcement 12 |
| AWM Embarkation Roll number | 14/14/6 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A60 Aeneas on |
| Regimental number from Nominal Roll | 4443A |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 48th Battalion |
| Other details from Roll of Honour Circular | Died in the 8th Field Ambulance hospital of wounds recieved at Proyart, France. |
| Fate | Died of wounds |
| Place of death or wounding | Proyart, near Peronne, France |
| Age at death | 18.10 |
| Age at death from cemetery records | 18 |
| Place of burial | Adelaide Cemetery (Plot III, Row I, Grave No. 15), Villers-Bretonneux, France |
| Panel number, Roll of Honour, Australian War Memorial | 146 |
| Miscellaneous information from cemetery records | Parents: Mr and Mrs W. O'BRIEN, 23 Henderson Street, Fremantle, Western Australia |