| Regimental number | 34797 |
| Place of birth | Crookwell New South Wales |
| Religion | Roman Catholic |
| Occupation | Clerk |
| Address | 33 Marion Street, Enmore, Sydney, New South Wales |
| Marital status | Single |
| Age at embarkation | 20 |
| Next of kin | Father, George C O'Brien, 33 Marion Street, Enmore, Sydney, New South Wales |
| Enlistment date | |
| Rank on enlistment | Driver |
| Unit name | Field Artillery Brigade, April 1917 Reinforcements |
| AWM Embarkation Roll number | 13/128/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A29 Suevic on |
| Rank from Nominal Roll | Driver |
| Unit from Nominal Roll | 1st Divisional Ammunition Column |
| Fate | Returned to Australia |
| Miscellaneous information from cemetery records | Plaque in New South Wales Garden of Remembrance |
| Date of death |