| Regimental number | 2858 |
| Place of birth | Ballarat Victoria |
| Religion | Roman Catholic |
| Occupation | Clerk |
| Address | 132 Primrose Street, Essendon, Victoria |
| Marital status | Single |
| Age at embarkation | 32 |
| Next of kin | Father, James William O'Brien, 132 Primrose Street, Essendon, Victoria |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 38th Battalion, 6th Reinforcement |
| AWM Embarkation Roll number | 23/55/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A7 Medic on |
| Regimental number from Nominal Roll | 2858A |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | Australian Army Pay Corps |
| Fate | Returned to Australia |
Postal Address:
Po Box 7916
Canberra BC 2610, Australia
Street Address:
Northcott Drive,
Campbell, ACT 2600
