Dr. Klemens Kohlgrüber undertook a metalworking apprenticeship and completed further training as a mechanical engineer in Cologne. He studied mechanical engineering in Wuppertal, followed by a diploma and doctorate at RWTH Aachen University. From 1986 to 2015, he worked for Bayer AG, among other things as Head of High Viscosity, Mixing, and Reactor Technology. At the same time, he gave lectures for several years at the University of Dortmund for chemists in the master’s program on polymer processing/preparation. For several years he was head of the High Viscosity Technology working group of the Forschungsgesellschaft Verfahrenstechnik (German Research Association for Process Engineering) and he is a former member of the Association of German Engineers (VDI) advisory board for plastics processing technology. Dr. Kohlgrüber also leads annual VDI seminars on extruders.