The jury has selected the thesis of dr.ir. Stef van den Elzen as the best PhD thesis of 2015. The thesis was very well written and also graphically well designed. The thesis addressed not only in a scientific sound and fundamental manner the topic of “Interactive Visualization of Dynamic Multivariate Networks”; it did this in a very comprehensive manner that included user studies and also a clear perspective on application areas outside the scope of the thesis. Therefore the jury concluded that this thesis definitely deserves the title “best PhD thesis 2015”.