Professor Denison graduated from Aberdeen University and undertook junior posts in Aberdeen, Glasgow and Edinburgh. He returned to Aberdeen to train in Radiology. He became a Consultant in 2006.
In addition to his clinical interests, he has expertise in medical education and is Teaching Dean for the undergraduate MBChB programme in Aberdeen University and Deputy Director of the Institute for Education in Medical and Dental Sciences. He also undertakes radiology and education research, is an Education Associate for the General Medical Council and holds leadership roles in several Scottish and UK radiology and education committees.