| Regimental number | 957 |
| Religion | Roman Catholic |
| Occupation | Salesman |
| Address | Englewood Carabella Street, Milsons Point, Sydney, New South Wales |
| Marital status | Married |
| Age at embarkation | 43 |
| Next of kin | Son, Harry Theodore O'Sullivan, Englewood Carabbella Street, Milsons Point, Sydney, New South Wales |
| Enlistment date | 24 February 1915 |
| Rank on enlistment | Private |
| Unit name | 18th Battalion, C Company |
| AWM Embarkation Roll number | 23/35/1 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board Transport A40 Ceramic on 25 June 1915 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 18th Battalion |
| Fate | Returned to Australia 4 May 1917 |
| Date of death | 7 July 1956 |
| Place of burial | Mona Vale Cemetery |
