Before I came to Mainz I worked for many years at the Max Planck Institute for Gravitational Physics in Potsdam. There I was mainly concerned with mathematical problems coming from general relativity. In that context I worked with many different types of differential equations. These included ordinary differential equations, hyperbolic, elliptic, parabolic and kinetic equations. Here is a list of the people who worked in my group, as diploma students, PhD students and postdocs.