| Regimental number | 62621 |
| Occupation | Clerk |
| Next of kin | Father, A O'Brien, Putiki Bay, Awaroa |
| Rank on embarkation | Rifleman |
| Unit name | New Zealand Expeditionary Force, 31st Reinforcements, New Zealand Rifle Brigade Reinforcements, G Company |
| Embarkation details | Unit embarked from Wellington on board HMNZT 97 Tahiti on |
| Final rank | Rifleman |
| Final unit | 1st Battalion, New Zealand Rifle Brigade |
| Fate | Died of wounds |
| Age at death from cemetery records | 20 |
| Place of burial | Caudry British Cemetery (Plot IV, Row D, Grave No 10), nr Cambrai, France |
| Miscellaneous information from cemetery records | Parents: A. & N. O'Brien, Putiki Bay, Waiheke Island, Auckland |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
| Sources | Nominal Roll Vol. 3: Roll 75, p. 23 |