Mr Mueller’s professional career comprises the following timeline: in 1992 he started as a civil engineer in DB, between 1999 – 2004, he was the Head of technology for electric locomotives, between 2005 – 2011 he was the Head of standardisation of rolling stock, in 2012 – 2016 he became the Head of technology management and  since 2016 he is the program manager for standardisation in CCS.