Kai Lawonn has successfully defended his Phd thesis on “Illustrative Visualization of Medical Datasets” September, 15. Kai made a number of contributions related to feature lines applied to medical surface meshes. A systematic comparison of existing techniques, the development of new techniques, bridging between feature lines and hatchings, new applications in virtual endoscopy and molecular dynamics. Also for visualizing vascular surfaces along with internal blood flow Kai could strongly improve over existing methods. All this was accomplished in only 2.5 years. The Phd committee rated his performance as “Summa cum laude”.