Francis John Gunning was the son of Henry Gunning (1768-1854). He served his articles of clerkship at “Southampton Buildings, Middlesex” and qualified as an attorney 1821 setting up practice on his own in an office in Trumpington Street. In 1832 he took on an articled clerk, Clement Francis, and when he qualified in 1838 the entered into a partnership to form Gunning and Francis. This continued until Francis Gunning died in 1846
He was closely involved with the reforming liberalising and emancipating movement which began in Cambridge in the 1820s.
He married Sarah (nee Bircham) sister of Francis Bircham Gunning's first articled clerk.
In 1839 he was Town Clerk; Deputy Registrar of the Archdeaconry of Ely and Commissioner for Bankrupts and was practicing from Cambridge Town Hall. However, in November 1840 the council voted to remove him from the position of Town Clerk by 20 votes to 17.
Francis Gunning qualified as an attorney in 1821 and set up practice on his own in Trumpington Street. In 1832 he took on an articled clerk, Clement Francis and when he qualified in 1838 they set up together to form Gunning and Francis. This ended in 1846 on the death of Francis Gunning. Clement Francis then worked as a sole practitioner, taking over the work of Christopher Pemberton in 1850, until he took on two partners in 1861 to form Francis Webster and Riches
Number 5 rower in the 1958 Crew for the Kent School, Connecticut.