He is interested in mathematics education, specifically in teachers’ mathematical knowledge and in the quality of mathematics textbooks. In 2012, he co-edited an issue of ZDM: The International Journal of Mathematics Education (Vol 44, Issue 3) on the topic of Measuring Teacher Knowledge – Approaches and Results from a Cross-National Perspective. His current area of research is in the practice of teaching and how prospective and practising teachers learn to teach. An tUasal Aodán Mac Suibhne