After studyind at Ulrich Koch and Kim Kashkashian and engagement as principal viola player at the Camerata Bern, Ruth Killius played as soloist with renowned orchestras such as the Boston Symphony Orchestra, Residentie Orkest Den Haag, Royal Northern Sinfonia, Camerata Salzburg, Basler Sinfonie Orchester, Budapest Festival Orchestra, Vienna Chamber Orchestra, MDR Symphony Orchestra, the Australian Symphony Orchestra, the Sydney Symphony Orchestra, the Odense Symphony Orchestra. She is a regular guest at major festivals such as the Lucerne Festival, the Schleswig-Holstein Musik Festival, the Edinburgh International Festival and the Helsinki Festival. She expands the standard repertoire for her instrument with contemporary music and also inspires composers: Heinz Holliger wrote a commissioned work by the Salzburg Festival – “Janus”, a double concert for violin, viola and orchestra. Furthermore the world premiere of the double concerto “That Subtle Knot”, a work dedicated to the duo Thomas Zehetmair and Ruth Killius, which was presented with the Royal Northern Sinfonia was received with huge interest. In 1994 she founded the Zehetmair Quartet together with Thomas Zehetmair which meanwhile belongs to the most important string quartets. A recording of Hindemith’s string quartet no. 4 and Bartók’s no. 5 is labelled ‘referential’ by the media and was also rewarded the Diapason d’Or of the year. The ensemble’s latest album includes pieces by Beethoven, Bruckner, Hartmann and Holliger. With Thomas Zehetmair she performs sonata-programmes for Viola and Violin in many major music centres. Inspired by Scelsi’s “Manto” for a singing violist the CD “Manto and Madrigals” of the duo has been released by ECM in March 2011. It contains works by Bartók, Holliger and Martinů amongst others. Ruth Killius has been porfessor for viola at the Johannes Gutenberg Universität Mainz from 2001 to 2003.