| Place of birth | Melbourne, Victoria |
| Religion | Church of England |
| Occupation | Teacher |
| Address | North Perth, Western Australia |
| Marital status | Married |
| Age at embarkation | 29 |
| Height | 5'11.75" |
| Weight | 142 lbs |
| Next of kin | Wife, Mrs Lily Dorunda Senior, 22 Grosvenor Road, North Perth, Western Australia |
| Previous military service | Hon. Com. in C.M.F. 10yrs service Cadets |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Place of enlistment | Perth, Western Australia |
| Rank on enlistment | 2nd Lieutenant |
| Unit name | 39th Battalion, 6th Reinforcement |
| AWM Embarkation Roll number | 23/56/3 |
| Embarkation details | Unit embarked from Fremantle, Western Australia, on board HMAT A34 Persic on |
| Rank from Nominal Roll | Lieutenant |
| Unit from Nominal Roll | 39th Battalion |
| Fate | Returned to Australia |
| Miscellaneous information from cemetery records | Parents: Charles and Mary Jane SENIOR |
| Discharge date | |
| Other details |
War service: Western Front Commenced return to Australia on board HT 'Demosthenes', 16 January 1919; disembarked Perth, 22 February 1919; discharged (appointment terminated), Perth, 28 March 1919. Medals: British War Medal, Victory Medal Death attributed to war service. |
| Date of death | |
| Age at death | 49 |
| Place of burial | Karrakatta Cemetery, Perth, Western Australia |
| Sources | NAA: B2455, SENIOR Arthur William |