Klaus Müller took office as President of the Bundesnetzagentur in Bonn in March 2022. Prior to that he had been the executive director of the Federation of German Consumer Organisations (Verbraucherzentrale Bundesverband e.V.) in Berlin. He held the same position at the North Rhine-Westphalia consumer organisation (Verbraucherzentrale Nordrhein-Westfalen e. V.) in Düsseldorf from 2006 to 2014. Klaus Müller was a member of the regional parliament of Schleswig-Holstein in Kiel for one year, where he also served as minister of the environment, nature conservation and agriculture from 2003 to 2005 and minister of the environment, nature and forestry from 2000 to 2003. He was a member of the German Bundestag in Bonn/Berlin for two years from 1998, having begun his professional career at the Schleswig-Holstein investment bank (IB.SH) in Kiel in the same year following a degree in economics. Klaus Müller is a member of the Heinrich Böll Foundation and a German Marshall Fund fellow.