Udo Nehren is a researcher and lecturer in Geography and Ecosystem Management at the Institute for Technology and Resources Management in the Tropics and Subtropics at TH Köln, Germany. He received a diploma in Physical Geography from University of Trier, a Master of Engineering in Technology in the Tropics from TH Köln, and a PhD in Geography from University of Leipzig. He completed his habilitation at University of Passau with a dissertation on “Sustainable management of tropical and subtropical landscapes based on the concept of ecosystem services”. His research emphasizes on environmental change, ecosystem-based disaster risk reduction and adaptation, and ecosystem management with regional foci in Latin America and Southeast Asia. He published several books and articles on these topics.