| Date of birth | |
| Place of birth | Snowtown, South Australia |
| Religion | Church of England |
| Occupation | Telegraphist |
| Address | Edgarley, Kadina, South Australia |
| Marital status | Single |
| Age at embarkation | 29 |
| Next of kin | W E Jacob, Kadina, South Australia |
| Enlistment date | |
| Rank on enlistment | Captain |
| Unit name | 10th Battalion, H Company |
| AWM Embarkation Roll number | 23/27/1 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board Transport A11 Ascanius on |
| Rank from Nominal Roll | Lieutenant-Colonel |
| Unit from Nominal Roll | 10th Battalion |
| Promotions |
Lieutenant Colonel Unit: General List Promotion date:
Unit: No 2 Com Depot |
| Fate | Returned to Australia |
| Family/military connections | Brothers: [309] Lt Gordon Hillier JACOB, 51st Bn, returned to Australia, 5 April 1918; 2020 Pte Jack JACOB, Australian Army Service Corps, returned to Australia, 29 July 1915; [770] Lt Kenneth Grant JACOB, 12th Bn, killed in action, 30 May 1918. |
| Other details |
War service: Egypt, Gallipoli, Western Front Commanded 10th Bn, 1917-18. |