| Regimental number | 39300 |
| Date of birth | |
| Place of birth | South Dunedin |
| Religion | Roman Catholic |
| Occupation | Labourer |
| Marital status | Single |
| Age at embarkation | 21 |
| Height | 5' 7" |
| Weight | 160 lbs |
| Next of kin | Mother, Mrs N O'Brien, 359 Cargill Road, South Dunedin |
| Previous military service | Served in the Territorial Force; still serving at time of NZEF enlistment. |
| Enlistment date | |
| Place of enlistment | Dunedin |
| Rank on embarkation | Private |
| Unit name | New Zealand Expeditionary Force, 22nd Reinforcements, Otago Infantry Regiment, D Company |
| Embarkation details | Unit embarked from Wellington on board HMNZT 76 Aparima on |
| Final rank | Private |
| Final unit | 2nd Battalion, Otago Infantry Regiment |
| Fate | Killed in Action |
| Age at death from cemetery records | 22 |
| Place of burial | No known grave |
| Commemoration details | Tyne Cot Memorial (New Zealand Apse, Panel No 3), nr Ieper, Belgium |
| Miscellaneous information from cemetery records | Mother: Norah O'Brien, 359 Cargill Road, South Dunedin |
| Family/military connections | Brother: 8/136 Pte Thomas O'BRIEN, Otago Infantry Regiment, killed in action, 9 August 1915. |
| Other details |
War service: Western Front Embarked Wellington, 16 February 1917; disembarked Devonport, England, 2 May 1917, and marched into Sling Camp. Proceeded overseas to France, 6 June 1917; joined 2nd Bn, Otago Infantry Regiment, in the field, 25 June 1917, and posted to 4th Company. Killed in action, 12 October 1917. Medals: British War Medal, Victory Medal |
| Miscellaneous details | Parents: John and Norah O'BRIEN (both b. Ireland) |
| Sources | Nominal Roll Vol. 3: Roll 55, p. 14 Archives New Zealand (Wellington), Agency AABK, Series 18805, File 21381395 |