Hannes Leitgeb aims to push mathematics deep into the domain of philosophy. His goal is to uncover the logical rules governing the workings of the brain. This makes him a valued partner for neuroscientists. The internationally renowned expert was recently awarded one of the prestigious Alexander von Humboldt Professorships. He is setting up the first university-based Center for Mathematical Philosophy in Europe – which will explore the interface between logic, mathematics and cognitive sciences.