Glyn qualified in Cardiff in 1975 and then trained in Liverpool and Edinburgh. He was appointed to the Academic Orthopaedic Unit, Southampton, as a Lecturer in 1984 with a major interest in external fixation of tibial fractures. He became an NHS Consultant in 1990 and worked at St Mary's Hospital, Isle of Wight, Treloar Hospital, Alton and more recently Royal Hospital Haslar, Gosport.