Martin Spencer-Smith was born on 27 June 1891, the son of Charlotte and Charles Spencer-Smith, Clerk receiver/Secretary of United Westminster School & Grey Coats Hospital. He attended Westminster City School and Christ College Brecon. He was 18 years old when he arrived at Harper Adams on 11 October 1909 for the two year Diploma course. He left the college on 19 August 1911.
According to the 1901 census Martin had two sisters Margaret and Joan Elizabeth and an elder brother Charles Owen Spencer-Smith who died of wounds on 3 August 1917 age 37 in the First World War.
Martin Spencer-Smith died on 10 September 1916, age 25, and is remembered with honour at the Thiepval Memorial, Cemetery/memorial reference: Pier and Face 13 C.
The Thiepval Memorial commemorates more than 72,000 men of British and South African forces who died in the Somme sector before 20 March 1918 and have no known grave, the majority of whom died during the Somme offensive of 1916.