| Date of birth | |
| Place of birth | South Australia |
| Other Names | ISAAC, Austell Stirling |
| Religion | Church of England |
| Occupation | Soldier |
| Address | 42 First Avenue, East Adelaide, South Australia |
| Marital status | Married |
| Age at embarkation | 30 |
| Next of kin | Wife, Mrs Mary Ethel Cecelia Isaac, 42 First Avenue, East Adelaide, South Australia |
| Enlistment date | |
| Rank on enlistment | Lieutenant |
| Unit name | 28th Battalion, C Company |
| AWM Embarkation Roll number | 23/45/1 |
| Embarkation details | Unit embarked from |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A11 Ascanius on |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A36 on |
| Rank from Nominal Roll | Captain |
| Unit from Nominal Roll | 28th Battalion |
| Promotions |
Captain Unit: Permanent Supernumery List Promotion date: |
| Fate | Returned to Australia |
| Miscellaneous details (Nominal Roll) | *Spelt Austell Stirling Isaac on NR |
| Miscellaneous information from cemetery records | Parents: William Thomas and Louisa Rachel ISAAC |
| Other details |
War service: Western Front Medals: British War Medal, Victory Medal |
| Date of death | |
| Age at death | 45 |
| Place of burial | Karrakatta Cemetery, Perth, Western Australia |