Ynnerman has chaired and hosted several international conferences including EuroVis 2007 and Eurographics 2010, the largest conferences in visualisation and computer graphics in Europe. He also charied the virtual conference EGEV 2020. He served as the chair of the the Eurographics association 2014–2016 and he was the chair of the Eurographics working group on Data Visualization and the chairman of the EuroVis steering committee until 2020. In 2021 and 2022 he is serving as overall papers chair for IEEE VIS.