Prof. Dr.- ing. Stieglitz is the Head of the Institute for Neutron Physics and Reactor Technology (INR), and Chair of Institute for Fusion and Reactor Technology (IFRT). He is Director of the Frederic Joliot Otto Hahn Summer School on Nuclear Reactors. His expertise lies in fusion technology, nuclear safety, solar thermal energy, liquid metal thermal hydraulics instrumentation, energy storage, and system analysis and system dynamics.