He co-organized three cardiovascular “Grand Challenges” that were organized by the BIGR, the coronary artery tracking challenge (coronary.bigr.nl), the carotid lumen segmentation and stenosis grading challenge (cls2009.bigr.nl), and the coronary stenoses detection and quantification challenge (coronary.bigr.nl/stenosis). He also initiated the MICCAI SWITCH workshop series that aims to bring together clinical and medical imaging experts working in the field of stroke and stroke treatment.

His interests are medical imaging, image guidance and navigation, visualization and software engineering.