| Regimental number | 4830 |
| Place of birth | Otley, Yorkshire, England |
| Religion | Roman Catholic |
| Occupation | Fireman |
| Address | Sailors Home, Sydney, New South Wales |
| Marital status | Married |
| Age at embarkation | 38 |
| Next of kin | Wife, Mrs C O'Brien, 3 John Street, Gravesend, Kent, England |
| Previous military service | Served for 8 months in the Royal Australian Navy. |
| Enlistment date | |
| Place of enlistment | Holsworthy, New South Wales |
| Rank on enlistment | Major |
| Unit name | 1st Battalion, 15th Reinforcement |
| AWM Embarkation Roll number | 23/18/4 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A15 Star Of England on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 53rd Battalion |
| Fate | Returned to Australia |
| Miscellaneous information from cemetery records | Photo: Robert and Sandra Crofts |
| Discharge date | |
| Other details |
War service: Egypt, Western Front Commenced return to Australia on board HT 'Borda', 26 September 1917; discharged (medically unfit: effects of gas poisoning), Sydney, 1 January 1918. Medals: British War Medal, Victory Medal |
| Date of death | |
| Age at death | 53 |
| Place of burial | Rookwood Necropolis (Sec. R.C. 9, 3887), Sydney, New South Wales |
| Sources | NAA: B2455, O'BRIEN William Joseph |
