Martin qualified in medicine from Newcastle University in 1982 and has worked as a GP since 1986. He obtained a Masters qualification in public health at Cambridge University in 1997. He has had a longstanding interest in applying evidence-based medicine to prescribing and therapeutics. He has previously worked for the National Prescribing Centre and the Department of Medicines Management at Keele University. From 1999 he has worked as a part-time GP in Conwy, North Wales, and initially worked as Medical Director for Conwy Local Health Board. Following the reorganisation of health services in Wales in 2009 he became Deputy then Acting Medical Director for the Health Board which manages all primary and secondary care NHS services in North Wales. He helped to organise and run the Diploma in Therapeutics at Cardiff University between 2005 and 2010. He chaired the New Medicines Group for Wales from inauguration in 2007 through to 2010. He is a Clinical Adviser on prescribing and evidence-based medicine for the Royal College of GPs, and is member of one of NICE's technology appraisal committees.