| Regimental number | 11/804 |
| Address | Pirinoa Featherston |
| Marital status | Single |
| Next of kin | Father, John O'Callaghan, Greytown |
| Rank on embarkation | Trooper |
| Enlistment status | Volunteer |
| Unit name | New Zealand Expeditionary Force, 2nd Reinforcements, Wellington Mounted Rifles |
| Embarkation details | Unit embarked from Wellington on board Verdala on |
| Final rank | Sergeant |
| Final unit | Wellington Mounted Rifles Regiment |
| Fate | Killed in Action |
| Age at death from cemetery records | 34 |
| Place of burial | No known grave |
| Commemoration details | Chunuk Bair (New Zealand) Memorial (Panel 5), Gallipoli, Turkey |
| Miscellaneous information from cemetery records | Mother: Mary O'Callaghan, Greytown North, Wairarapa |
| Other details |
War service: Egypt, Gallipoli Medals: 1914-15 Star, British War Medal, Victory Medal |
| Miscellaneous details | Nominal Roll Vol. 1: Wellington Mounted Rifles/Second |