| Place of birth | Hobart, Tasmania |
| School | Church of England Grammar School, Melbourne, Victoria and St Peter's College, Adelaide, South Australia |
| Religion | Church of England |
| Occupation | Soldier |
| Address | Victoria Barracks, Sydney, New South Wales |
| Marital status | Single |
| Age at embarkation | 29 |
| Next of kin | Father, E T Wallack, Cb, Vic Barracks, Sydney, New South Wales |
| Previous military service | Lieut. in 5th and 10th Infantry Regiments Con Mil Forces and Tasmanian Cadets. |
| Enlistment date | |
| Rank on enlistment | Captain (Adjutant) |
| Unit name | 2nd Battalion, Headquarters |
| AWM Embarkation Roll number | 23/19/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board TRANSPORT A23 Suffolk on |
| Rank from Nominal Roll | Captain |
| Unit from Nominal Roll | 2nd Battalion |
| Other details from Roll of Honour Circular | A good all round athlete. |
| Fate | Killed in Action |
| Place of death or wounding | Gallipoli, Turkey |
| Date of death | |
| Age at death | 29 |
| Place of burial | Lone Pine Cemetery (Plot II, Row D, Grave 11), Gallipoli, Turkey. |
| Panel number, Roll of Honour, Australian War Memorial | 34 |
| Miscellaneous information from cemetery records | Parents: Maj. Gen. Ernest T and Alice May WALLACK. |
| Other details |
War service: Egypt, Gallipoli Medals: 1914-15 Star, British War Medal, Victory Medal |