Kristina Ruge first studied piano in Freiburg and Frankfurt with Prof. Vitaly Berzon and Prof. Irina Edelstein. She then studied opera correpetition with Prof. Eugen Wangler in Frankfurt and Maria Conti Gallenti in Italy.
She gained her first opera experiences at the Staatstheater in Mainz and the Theater Bremen before she was engaged as a solo répétiteur at the Theater in Koblenz from 2012 to 2018. Since 2018 she has been living in Frankfurt and works as a freelance guest at various opera projects and theatres. In 2019 she took over the direction of studies at the International Opera Academy of Jeunesses Musicales in Weikersheim. She also teaches at the University of Music and Performing Arts in Frankfurt and at the University of Music in Karlsruhe.