クラウス・フーバー
Ratkje studied composition at the Norwegian Academy of Music in Oslo under the tutorship of Lasse Thoresen, Olav Anton Thommessen and Asbjørn Schaathun, and got her diploma in 2000. During the summer of 1999, Ratkje studied at IRCAM and she has also studied individually with composers such as Louis Andriessen, Sofia Gubaidulina, Ivar Frounberg, Klaus Huber, Joji Yuasa and Kaija Saariaho.