The Max Planck Institute for Gravitational Physics (Albert Einstein Institute/AEI) is one of the world’s leading centers for gravitational physics, with a unique breadth and depth of its approach to the subject. Scientists at the AEI focus on all aspects of Einstein’s theory of general relativity. The research topics range from the theoretical, observational and experimental aspects of gravitational-wave physics and astrophysics, to unification of general relativity and quantum mechanics, all the way to geometrical and analytical aspects of the theory. The AEI has two branches, one in Potsdam, and one in Hannover where it is closely related to the Leibniz Universität Hannover.