[1] He was commissioned into the 17th Lancers on 19 November 1886[2] and retired with the rank of captain on 25 March 1896,[3] but volunteered to serve in the Second Boer War as a major in the Imperial Yeomanry.
[2] On 2 December 1905 he was appointed Honorary Colonel of the 1st Volunteer Battalion, Royal Fusiliers.
[2] Jessel was a member of the Westminster City Council, representing Grosvenor Ward.
[4] Jessel was elected to Parliament as a Liberal Unionist for St Pancras South in an 1896 by-election (succeeding his deceased father-in-law Sir Julian Goldsmid).
Lord Jessel died in November 1950, aged 84, and was succeeded by his only son, Edward.