Bassist, pianist, keyboardist, and backing vocalist for the German pop punk band Tokio Hotel.
He already knew drummer Gustav Schafer from music school before the group formed in 2001 under the name Magdeburg.
With Tokio Hotel, he won a MTV Video Music Award for Best New Artist in September of 2008. They have won several other international MTV Music Awards as well.
He was born in Halle, Saxony-Anhalt, Germany.
He performs alongside Bill Kaulitz in Tokio Hotel.