Gerhard Stryi-Hipp is a graduate physicist and has been working in the field of renewable energies for over 30 years. He was managing director of solar industry associations for 15 years and has been researching solutions for a climate-neutral energy supply at the Fraunhofer Institute for Solar Energy Systems ISE in Freiburg since 2009. With his research group on climate-neutral cities and neighbourhoods, he develops concepts for the energy transformation of municipalities. He is the scientific director of the lighthouse project EnStadt:Pfaff, which uses the example of the Pfaff neighbourhood in Kaiserslautern to research and demonstrate how a climate-neutral neighbourhood can be developed in practice.