He attended the University of Glasgow and attained an MBChB in 1997. His post-graduate qualifications include Fellow of the Royal College of Anaesthetists in 2004 and Fellow of the Faculty of Intensive Care Medicine, awarded in 2014.
The early years of his career were spent in Scotland and he then worked in a number of UK hospitals, gaining valuable experience in different areas.
Dr McColl undertook specialist training in anaesthesia and intensive care medicine in the Coventry school of anaesthesia from 2005 to 2010. During this time he undertook advanced training in obstetric anaesthesia as well as higher level training in paediatric anaesthesia and intensive care medicine. Dr McColl also undertook a fellowship in clinical education and obtained a post-graduate award in clinical education from Warwick University.
Before coming to Guernsey, he worked at the North Cumbria University Hospitals NHS Trust for six years, pursuing a broad range of anaesthesia specialties. His particular interests included intensive care medicine, anaesthesia for vascular surgery and trauma surgery and paediatric anaesthesia. He was clinical lead for paediatric anaesthesia in North Cumbria for five years and his roles within the Intensive Care Department included being the Clinical Lead for organ donation and the FICM faculty tutor for Intensive Care Medicine.