Markus Reuther of the Mathematics of Transportation and Logistics Group defended his thesis titled "Mathematical Optimization of Rolling Stock Rotations" at TU Berlin. The work orginated from a research project with DB Fernverkehr AG and solves the problem to compute optimal schedules for the Intercity Express (ICE) high-speed trains of Deutsche Bahn. The photo shows committee head Volker Mehrmann, reviewer Martin Grötschel, former DB project head Kerstin Waas, Markus Reuther himself, and reviewer Ralf Borndörfer.