Dr. Klaus Müschen has been working in the field of climate protection, energy policy and energy transition for 35 years. Between 2006 and 2016 he was Head of the department "Climate Protection and Energy" at the federal Environmental Agency (Umweltbundesamt) in Dessau. His department was responsible for studies and recommendations concerning the energy programme of the German government, the preparation of the Conferences of the Parties organized by the UNFCCC as well as the national reporting on environmental and energy policies. From 1989 to 2005 Dr. Müschen was Head of the Department for climate protection and energy planning of the Berlin Senate. During this period, he served as a member of the supervisory board of the Berlin Energy Agency. After having completed his studies in electrical engineering and social sciences at the University of Hanover he finalised his doctorate in political science and sociology in 1979. Afterwards he worked as a teacher and then as a lecturer for electrical engineering at the University of Hamburg. Following the Chernobyl reactor catastrophe, he joined the Öko-Institut in Freiburg and worked on nuclear phase-out scenarios and energy services.