He studied at the Mozarteum and with Heinrich Schiff at the Basel Musikhochschule.Mr. Hagen won two prizes awarded by the Vienna Philharmonic, the prize for musicians under the age of 19 and the Karl Böhm Prize.
As soloist he has toured throughout Europe and has appeared with such orchestras at the Vienna Philharmonic Orchestra under Nikolaus Harnoncourt, and Franz Welser-Möst, Vienna Symphony, the Deutsche Kammerphilharmonie, the English Chamber Orchestra, the Camerata Salzburg and the NHK Symphony.