BSc Manch 1927, MB ChB 1930; FRCS Eng 1936.
Kenyon studied medicine at the University of Manchester where he was awarded a number of prizes. After qualifying, Kenyon was house surgeon at MRI before going to Christie Hospital Manchester where he was surgical registrar and later resident surgical officer. He returned to MRI as resident casualty officer in 1934, and was also senior house surgeon at Biddulph Grange Orthopaedic Hospital. From 1939 to 1942 Kenyon was surgical tutor at MRI. From 1939 he was also honorary assistant surgeon at Christie Hospital, where he worked with Ralston Patterson on research into the treatment of breast cancer. Kenyon was also honorary surgeon to Manchester Northern Hospital, honorary surgeon to Royal Manchester Children's Hospital and visiting surgeon to Oldham Royal Infirmary. During the war Kenyon was eager to join the armed forces, but his services were required at the Children's Hospital and he could not be released. Kenyon was a fellow of MMS, of which he was treasurer. He was also a member of Manchester Surgical Society, Manchester Medico-Legal Society, and Manchester Pathological Society.