Lead singer of the band Tokio Hotel whose first single, "Monsoon," reached #1 in Germany within a month. In 2016, he began performing under the stage name Billy, releasing his debut EP I'm Not OK.
He auditioned for a reality TV talent show called Star Search.
He voiced the part of Arthur in the German version of the film Arthur and the Invisibles.
He has an identical twin brother named Tom who has also been a part of Tokio Hotel.