[3] During World War I Fenner served in the Territorial Force as a member of the Royal Army Medical Corps.
After the war he worked as a groundsman and was the professional at The Mote Cricket Club in Maidstone.
His performances for The Mote brought him to the attention of Kent, and Fenner made his debut for the county's Second XI in 1923 before being employed at the club's Tonbridge Nursery between 1924 and 1927.
[5] He was considered one of the best cricket coaches of his day, working at the club until 1934 when he was succeeded by Archie Fowler.
The couple had a daughter and a son, Maurice Fenner, who played 33 first-class matches for Kent and the Combined Services cricket team.