As an actor, he has appeared in many television and film productions such as Ein Fall für zwei, Tatort: Einmal täglich, Tatort: Der Traum von der Au, Drei mit Herz, Kommissar Rex, and Doppelter Einsatz.
Grabosch has had a long career in movies and television, beginning at the young age of 13, when he won Tele 5's screenplay competition with his short story Der erste Kuß (The First Kiss).
[4] He was substantially involved in creating, in cooperation with Alles was zählt's writers, the reunion storyline of the popular pairing known as Dero (Deniz Öztürk and Roman).
[6] While their story was spotlighted, the "DeRo" storyline reached a wide international fanbase with over 12,000 subscribers on YouTube.
[11] In 2009, he illustrated the cover of Kiki Kufenflitzer – Der Eiskristall, a children's book written by Tanja Szewczenko, his former co-star on Alles was zählt.