| Regimental number | 24/312 |
| Address | 67 Clarence Street, Ponsonby, Auckland |
| Marital status | Single |
| Next of kin | Father, Francis Tiernan, Coromandel |
| Rank on embarkation | Rifleman |
| Enlistment status | Volunteer |
| Unit name | New Zealand Expeditionary Force, New Zealand Rifle Brigade, 2nd Battalion, A Company |
| Embarkation details | Unit embarked from Wellington on |
| Final rank | Lance Corporal |
| Final unit | 2nd Battalion, New Zealand Rifle Brigade |
| Fate | Killed in Action |
| Age at death from cemetery records | 24 |
| Place of burial | No known grave |
| Commemoration details | Caterpillar Valley (New Zealand) Memorial, Longueval, Somme, France |
| Miscellaneous information from cemetery records | Parents: the late Francis and Sarah Tiernan |
| Family/military connections | Brother: 12/1089 Bertram Arthur TIERNAN |
| Other details |
War service: Egypt, Western Front Medals: 1914-15 Star, British War Medal, Victory Medal |
| Miscellaneous details | Nominal Roll Vol. 1: A Company/2nd NZRB |