| Regimental number | 605 |
| Place of birth | Ballarat Victoria |
| Religion | Church of England |
| Occupation | Labourer |
| Address | Ballarat North, Victoria |
| Marital status | Single |
| Age at embarkation | 19 |
| Next of kin | Father, Henry Simpkins, Lexton Street, Ballarat North, Victoria |
| Enlistment date | 27 March 1916 |
| Rank on enlistment | Private |
| Unit name | 39th Battalion, B Company |
| AWM Embarkation Roll number | 23/56/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A11 Ascanius on 27 May 1916 |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 39th Battalion |
| Fate | Returned to Australia 14 January 1919 |
| Miscellaneous details (Nominal Roll) | *Leon spelt Lion |
