He completed an education as a display artist with Karstadt in Saarbrücken, before moving to Berlin in February '89. Here he studied theatre studies and comparative literature at Freie Universität, while running the independent venue “Theaterdock in der Kulturfabrik” together with Gesine Danckwart and other students.
In 1998, he meets René Pollesch and becomes his assistant for the Heidi Hoh-trilogy at Podewil in Berlin. Together with Pollesch he moves to Schauspielhaus Hamburg in 2000, where, for three years, he works as the director's assistant of Stefan Pucher, Jan Bosse, Michael Laub, Luc Perceval and Jérôme Bel. Questions of representation and (theatrical-)architecture move more and more into the centre of his (theatre-)interest.
During their work on Deadline, he meets Rimini Protokoll in Hamburg. A close collaboration with Stefan Kaegi for Cargo Sofia-Xbegins in 2005. For four years, Karrenbauer tours, together with two Bulgarian truck drivers, through Europe and the Middle East, before developing new versions for festivals in Tokyo, Singapore and the EXPO in Shanghai. Together with Kaegi and Lola Arias he implements the festival Ciudades Paralelas in Cork, Warsaw and Singapore and sets up Call Cutta in a Box in multiple cities.
Together with Aljoscha Begrich, Helgard Haug and Kaegi, he reactivates the Cargo-Truck as a mobile auditorium for Truck Tracks Ruhrand subsequently develops DO's & DONT's with Begrich and Haug. Since 2013, he sets up and adapts Kaegi's audiowalk Remote X in large and small cities around the world.
Cargo Sofia-X - Co-direction
Cargo Asia - Co-direction
Remote X - Co-direction
Truck Tracks Ruhr - Co-direction
DO's & DON'Ts - Co-concept / Co-text / Co-direction