He was the son of the Rev'd Samuel Guiler Kennedy and mother unknown (not in 1901 Irish Census).
In 1901 the family lived in house 5, Crescent Gardens, Windsor, Belfast.
Following his education at RBAI (Inst), Kennedy joined Northern Bank on 4th January 1910 at Head Office. Transfers followed to Shaftesbury Square (1910), Magherafelt (1911), Shaftesbury Square (1912) and Head Office – relief (1912).
In 1911 Kennedy was living in house 31, Cromwell Road, Cromac Ward, Belfast. He is recorded as a Bank Clerk.
On 9th September 1914, whilst based in Head Office, he volunteered and enlisted into the 14th Bn. Royal Irish Rifles as a Private (Rifleman) with Service Number 14/16657. His unit is also recorded as the Young Citizen Volunteers (11th Bn. R I R).
Kennedy was killed in action on 7th June 1917 and is buried in the Spanbroekmolen British Cemetery, Belgium.
In the July 1917 edition of the Inst School News it was announced that Kennedy had been awarded a Certificate for Gallantry in the field.
He was awarded the 1914/15 Star, the British Victory Medal and the British War Medal.