| Regimental number | 3629 |
| Place of birth | Longwarry Victoria |
| Religion | Presbyterian |
| Occupation | Bridge constructor |
| Address | Abbotsford, Sydney, New South Wales |
| Marital status | Single |
| Age at embarkation | 24 |
| Next of kin | Father, Alex. Clark Mackay, c/o Norton Griffiths, Gundarene, New South Wales |
| Enlistment date | 23 November 1916 |
| Rank on enlistment | Private |
| Unit name | 1st Pioneer Battalion, 9th Reinforcement |
| AWM Embarkation Roll number | 14/13/4 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A68 Anchises on 24 January 1917 |
