My major research interests in theoretical condensed matter range from mesoscopic physics and spintronics to quantum transport in graphene- and topological insulator-based nanosystems. Furthermore, my group develops and applies semiclassical path integral methods for bosonic and fermionic many-body systems. I obtained my Ph.D. in theoretical atomic physics at the University of Freiburg (Germany). After postdoctoral stays in Stuttgart (Germany), Orsay (France) and Augsburg (Germany), I spent five-years as head of a research group at the MPI for the Physics of Complex Systems in Dresden, Germany. In 2001 I took up a Chair in Condensed Matter Theory at the University of Regensburg. There I was dean and dean of studies of the Physics Department. Furthermore, I have been spokesperson of the Division “Dynamics and Statistical Physics” and of the Condensed Matter Section of the German Physical Society, and presently I am a member of its board. Since July 2017 I am moreover the spokesperson of the DFG-funded Collaborative Research Center 1277 "Emergent Relativistic Effects in Condensed Matter".