| Regimental number | 11923 |
| Place of birth | Australia |
| Occupation | Carrier |
| Next of kin | Father, M O'Brien, Duckmaloi, Oberon, New South Wales, Australia |
| Rank on embarkation | Private |
| Unit name | New Zealand Expeditionary Force, 12th Reinforcements (1st Draft), Wellington Infantry Battalion, B Company |
| Embarkation details | Unit embarked from Wellington on board HMNZT 51 Ulimaroa on |
| Final rank | Corporal |
| Final unit | 2nd Battalion, Canterbury Infantry Regiment |
| Fate | Killed in Action |
| Age at death from cemetery records | 32 |
| Place of burial | No known grave |
| Commemoration details | Buttes New British Cemetery (New Zealand) Memorial, Polygon Wood, Belgium |
| Miscellaneous information from cemetery records | Parents: Michael and Margaret O'Brien, 'Holmwood', Flinders Street, East Maitland, New South Wales, Australia |
| Medals |
Military Medal 'For conspicuous gallantry and devotion to duty. On the morning of the 2nd October 1917 during the course of a heavy bombardment, one of the men of the post was buried and severely wounded. In spite of the heavy fire, this man stood out on the parapet and dug his comrade out, and afterwards carried him in daylight back from the front line. His great bravery undoubtedly saved his comrade's life.'
Source: 'London Gazette' Date: |
| Other details |
War service: Western Front Medals: Military Medal, British War Medal, Victory Medal |
| Sources | Nominal Roll Vol. 2: Roll 30, p. 7 |