Felix Tettenborn finished his studies with a degree in civil engineering and environmental technology at the Hamburg University of Technology (TUHH). During his studies he was abroad as a research scholar and TA at the San Francisco State University, California, USA. From 2004 to 2009 he was working as a researcher at the Institute of Wastewater Management and Water Protection at the TUHH. Topics of investigation were nutrient recovery from wastewater streams and decentralized wastewater treatment concepts. Since September 2009 Dr. Tettenborn has been working at the Fraunhofer Institute for Systems and Innovation Research ISI.