Heiner Schenke was Principal Lecturer in German at the University of Westminster for many years. He now works at the University of Oxford and as a private language consultant. He has taught German at all levels and is the author of several language and grammar books, including the Willkommen! series and Enjoy German.Jonas Langner (Author) Jonas Langner has been teaching German at British universities for almost 20 years. He currently works as Senior Lecturer in German Language Education at King's College London, where he also coordinates the German programme for the Language Centre.