Matthias Braun has a significant model car collection and wrote a number of books on cars and models cars, most of them in German.
From 2001 until 2005, Matthias led the E-Business division at Audi and eventually was made responsible for operations of Audi of America by the Ingolstadt Car manufacturer. He held this position until 2008. Since then he has been the General Secretary of the AvD. He is also on the board of the German American Automobile Club.