Dr. Fellner is Associate Professor for Waste Management at TU Wien. From 2012 to 2020 he was heading the Christian Doppler Laboratory for Anthropogenic Resources, a temporary research centre that aimed at enhancing the sustainable utilization of man-made resources. Besides his work in different national and international organizations (ISWA International Solid Waste Association, IWWG International Waste Working Group, ÖWAV Austrian Association for Water and Waste Management) he is Associate Editor of the Waste Management journal (Elsevier). His research interests are the field of urban metabolism, solid waste management and resource recovery. The overall goal of his methodologically oriented research is to optimize the anthropogenic metabolism in view of environmental protection and resource conservation.