| Regimental number | 13/254 |
| Address | Kamo, Whangarei |
| Marital status | Married |
| Next of kin | Wife, Mrs H E Mackesy, Kamo, Whangarei |
| Rank on embarkation | Lieutenant |
| Enlistment status | Volunteer |
| Unit name | New Zealand Expeditionary Force, 8th Reinforcements, Auckland Mounted Rifles Regiment |
| Embarkation details | Unit embarked from Wellington on board Tofua on |
| Final rank | 2nd Lieutenant |
| Final unit | 4th (Waikato) Squadron, Auckland Mounted Rifles |
| Fate | Killed in Action |
| Age at death from cemetery records | 32 |
| Place of burial | New Zealand No 2 Outpost Cemetery (Special Memorial No 18), Gallipoli, Turkey |
| Miscellaneous information from cemetery records | Parents: Colonel C E R Mackesy DSO and Jessie Macksey; wife: Gertrude A Mackesy, 76 Vauxhall Road, Devonport, Auckland |
| Family/military connections | Father: 13/610 Colonel Ernest Randolph MACKSEY; |
| Other details |
War service: Egypt, Gallipoli Medals: 1914-15 Star, British War Medal, Victory Medal |
| Miscellaneous details | Nominal Roll Vol. 1: Auckland Mounted Rifles/Main Body |