Proxauf was born in Berlin. His mother is Austrian actress and artist agent Katja Proxauf. He started filming at the age of 9. His first minor role was the character of young Behrendt in the 2006 film Lohn deiner Angst.
Aus der Haut (tj. Stažený z kůže) je rakousko-německý televizní film z roku 2015, který režíroval Stefan Schaller. Film pojednává o coming outu teenagera.