Dr. Walton practised in northern Saskatchewan and rural British Columbia before settling as a general practitioner in West Vancouver. He trained at Liverpool University and University College London in the United Kingdom. He is a clinical assistant professor in the Department of Family Practice at the University of British Columbia, where he teaches undergraduates. For 18 years he was a director of the British Columbia Medical Association (now known as Doctors of BC), where he served on various committees; his roles included being a delegate to 13 General Councils of the CMA. He has a wide variety of interests including inequality, technology and the environment.