Denis is reputed internationally as a leading figure in Western calligraphy. Continual development of 32 years to date has followed a full-time education in calligraphy. A master of the broad pen in both traditional and uniquely individual experimental styles, his media includes calfskin vellum, paper, glass and film. His works have a unique beauty that is more than skin deep and are occasionally provocative. Denis has taught at the invitation of calligraphy guilds internationally since he was 20 years old and is known for his clarity of explanation in teaching. Also aged 20, he was elected as the youngest Fellow of the Society of Scribes and Illuminators, while working on The Great Book of Ireland from his home studio in Dublin. He has rare tech prowess for a craftsman, so his films are highly professional, as well as artistically presented.