As an actor, Geringas appeared in the 2002 Costa-Gavras film Amen. and episodes of the German TV series Die Pfefferkörner, Die Kommissarin, and Die Rettungsflieger. As a composer, he scored the German Hanni & Nanni movies and, after relocating to Los Angeles, several TV movies for the Hallmark Channel. Animation scores and themes include All Hail King Julien, Ice Age: Collision Course (the end title song), the Netflix Voltron series, and Home: Adventures with Tip & Oh. He co-wrote the Kelly Clarkson song "Dark Side."