Arjan van Timmeren is Full Professor Environmental Technology & Design, at the Faculty of Architecture and Built Environment and Department of Urbanism at Delft University of Technology (TUD) in The Netherlands. Over the years his work has focused on the integration of sustainable development in the field of the built environment in both practice and academia, with lately emphasis on Environmental technology, Urban Metabolism, Circular and Biobased Economy, Green-Blue concepts and smart cities, and -citizens. Besides of the TUD chair, among other, he has also been (co-)founding Scientific Director and now Principal Investigator at AMS Institute (Institute for Advanced Metropolitan Solutions), an initiative by TUD, MIT and WUR in Amsterdam, together with public and private stakeholders and citizen(platforms). At the moment he is Scientific Director of the ‘Rotterdam Delta Resilience Initiative’, a collaboration between City of Rotterdam, TU Delft, Erasmus University and Erasmus Medical Center. Besides, he is project leader of several European and national research projects. Finally, he is the Academic Portfolio Director Sustainable Cities for TUD Extension School and has seats in several (inter)national steering groups, quality teams (for Sustainability/CE), scientific boards (int.conferences), special issue editorships and is lecturing all over the globe as expert and keynote speaker.