| Religion | Church of England |
| Occupation | Mechanical engineer |
| Address | 92 Park Street, St Kilda, Melbourne, Victoria |
| Marital status | Single |
| Age at embarkation | 21 |
| Next of kin | Mother, Mrs Donaldena Leaper, 92 Park Street, St Kilda, Melbourne, Victoria |
| Enlistment date | |
| Rank on enlistment | 2nd Lieutenant |
| Unit name | Field Artillery Brigade 6, Battery 18 |
| AWM Embarkation Roll number | 13/34/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A34 Persic on |
| Rank from Nominal Roll | Captain |
| Unit from Nominal Roll | 6th Field Artillery Brigade |
| Recommendations (Medals and Awards) |
Military Cross Recommendation date: Mention in Despatches Not awarded. Recommendation date: |
| Fate | Returned to Australia |
| Medals |
Military Cross 'For conspicuous gallantry and devotion to duty as Forward Observing Officer. He carried out his work with great coolness and courage and under very heavy fire. He has on several previous occasions done fine work.'
Source: 'Commonwealth Gazette' No. 74 Date: |
| Family/military connections | Brother: Gunner Ian Malcolm LEAPER, Regimental No. 5589, 6th Army Field Artillery Brigade, returned to Australia 31 March 1919 |
| Other details |
War service: Egypt, Western Front Medals: Military Cross, 1914-15 Star, British War Medal, Victory Medal |