Magnus Fröhling is a professor of circular economy at TU Munich (TUM). At the TUM Campus Straubing for Biotechnology and Sustainability he develops quantitative approaches for the analysis, assessment and planning of circular economy and bioeconomy systems, including technologies for recycling and biomass conversion, as well as biorefineries, production and recycling networks and global material cycles. From 2015 until 2018 Magnus Fröhling served as  professor of business administration, especially resource management at TU Bergakademie Freiberg. He obtained his habilitation and teaching licence in business administration from Karlsruhe Institute of Technology (KIT). Magnus Fröhling received a doctoral degree in business administration from Universität Karlsruhe (TH) and holds a diploma in industrial engineering and management from the same institution. Michael Hiete is professor for chemistry and management (business chemistry) at Ulm University, Germany since 2016. His interdisciplinary research interests include techno-economic and life cycle assessment, sustainable industrial value chains as well as sustainability issues of raw materials and resources. Further interests are the sustainable built environment and risk management. In his work he uses a wide range of mostly quantitative methods. From 2012 to 2015 Michael Hiete was professor for industrial ecology and technological change at the Center for Environmental Systems Research (CESR), Universität Kassel. He received a habilitation degree and teaching licence for business management and environmental systems analysis from Karlsruhe Institute of Technology (KIT) and holds a diploma degree in environmental and doctorate in geosciences, both from Technische Universität Carolo-Wilhelmina Braunschweig.