Coen Rasch is a Radiation oncologist with a great interest in teaching and technical advancements in Radiation oncology. Coen was trained at Antoni van Leeuwenhoekhuis (AvL) 1991-1996 (prof. Bartelink) with a PhD at Free University Amsterdam in 2000 on observer variation in radiation oncology (thesis advisor G. Bartelink). He is a full professor at Leiden University and thesis advisor for over 20 completed PhD thesis. He is a Estro Teaching course director for multiple courses for over 13 years. His current focus of research is on Eye melanoma with proton therapy and Brachytherapy.