Director of ILEK (Institute of Lightweight Structures and Conceptual Design).
Mies van der Rohe Professor at the Illinois Institute of Technology in Chicago.
Co-founders of the German Sustainable Building Council DGNB (Deutsche Gesellschaft für Nachhaltiges Bauen e.V.) and Chairman between April 2008 and June 2010.
Guest expert at Transition Workshop from 2020 to 2023.