| Regimental number | 9/305 |
| Address | Otama, Southland |
| Marital status | Single |
| Next of kin | Father, John Mackay, Otama, Southland |
| Rank on embarkation | 2nd Lieutenant |
| Enlistment status | Volunteer |
| Unit name | New Zealand Expeditionary Force, Main Body, Otago Mounted Rifles Regiment |
| Embarkation details | Unit embarked from Wellington on |
| Three squadrons of the Otago Mounted Rifles Regiment left New Zealand on board 'Hawke's Bay', and one squadron on board 'Verdala'. From the Nominal Roll it is not possible to determine on which ship an individual embarked. | |
| Final rank | 2nd Lieutenant |
| Final unit | Otago Mounted Rifles Regiment |
| Fate | Killed in Action |
| Age at death from cemetery records | 25 |
| Place of burial | No known grave |
| Commemoration details | Chunuk Bair (New Zealand) Memorial (Panel 6), Gallipoli, Turkey |
| Miscellaneous information from cemetery records | Parents: John and Jane Mackay, Otama, Southland |
| Other details |
War service: Egypt, Gallipoli Medals: 1914-15 Star, British War Medal, Victory Medal |
| Miscellaneous details | Nominal Roll Vol. 1: Otago Mounted Rifles/Main Body |