Stephan Diehl is a full professor at University Trier, Germany. His main research areas are software engineering and information visualization, and in particular the intersection of both areas, nameley software visualization. A considerable part of his visualization research can be briefly characterized as applying (visual) data mining techniques to analyze software evolution and developing new ways to visualize the change of structured information over time. Stephan Diehl is author of the book "Software Visualization -- Visualizing the Structure, Behavior and Evolution of Software" (Springer). He is a member of ACM, IEEE, and GI, the steering committees of the IEEE working conference series on Mining Software Repositories MSR and on Software Visualization VISSOFT. Since 2007 he is a member of the scientific directorate of Schloss Dagstuhl -- Leibniz-Center for Informatics.