Arjan van Timmeren Arjan van Timmeren  is full professor Environmental Technology & Design at TUDelft, Faculty of Architecture and the Built Environment, Department Urbanism. Besides he is Scientific Director of Resilient Delta Initiative in Rotterdam (a joint initiative by TU Delft, Erasmus University and Erasmus Medical Center),  Academical Portfolio Director ‘Sustainable Cities’ for the TUD Extension School  for continuing education, and was (co)founding Scientific Director, and now Principal Investigator at AMS Institute in Amsterdam (Institute for ‘Advanced Metropolitan Solutions’, a joint initiative by TU Delft, Wageningen University and Research and MIT). His work focuses on sustainable development in the built environment, with emphasis on Urban Metabolism, Circular and Biobased Economy, Urban Climate and environmental behaviour, and Nature based technologies. He leads several (inter)national projects and has seats in (inter)national steering groups, quality teams and scientific boards.