Career in state politics

As a student in 1986 Müller joined the Young Union and from 1989 to 1990 was the CDU Chairman of the Student Union in Lower Saxony. From 1990 to 1992 and again since 2000, he has belonged to the Land executive of CDU Braunschweig and since 1998 has also been vice-chairman of the CDU for the district of Braunschweig.^[1]

Member of the German Parliament, 2005–2009; 2013-present

Since the 2005 elections, Müller has been member of the Bundestag. In parliament, he first served on the Committee on Education, Research and Technology Assessment before moving to the Committee on the Environment, Nature Conservation, Building and Nuclear Safety. On the latter committee, he was his parliamentary group's rapporteur on the environmental aspects of transport policy. Since 2018, he has been serving as member of the Committee on Economic Affairs and Energy; the Committee on Legal Affairs and Consumer Protection; and the Committee for the Scrutiny of Elections, Immunity and the Rules of Procedure. On the Committee on Legal Affairs and Consumer Protection, he is his parliamentary group's rapporteur on digital issues.

In addition to his committee assignments, Müller is a member of the Parliamentary Friendship Group for Relations with the Baltic States. In 2009, he joined Andreas Scheuer in initiating a cross-party group for the protection of antique cars.^[2]

Corporate boards

• Kraftverkehr Mundstock, Chairman of the Supervisory Board
• Minol Messtechnik W. Lehmann, Member of the Advisory Board
• Braunschweiger Verkehrs-GmbH, Chairman of the Supervisory Board (–2016)
• Cleanventure AG, Member of the Supervisory Board (–2014)

Non-profits

• German Industry Initiative for Energy Efficiency (DENEFF), Chairman
• Verein Mittelständischer Dienstleistungsunternehmen (VMDU), Chairman
• Association of German Foundations, Member of the Parliamentary Advisory Board (2005–2009)
• Federal Agency for Civic Education, Alternate Member of the Board of Trustees (2005–2009)