Roberto was inspired to start writing his own songs in 1998 while working with Riger for many years as the keyboardist. He named his forthcoming solo project "DORN". The debut album "Falschheit" released in mid-2000 received extraordinary recognition from both press and fans. Shortly after the release of "Falschheit", Roberto and CCP Records (Austria) signed a recording contract. In order to concentrate on his own project, Roberto decided to leave RIGER.