Furthermore Ruth Killius has recorded a CD for ECM with works by Elliott Carter and Isang Yun together with Heinz Holliger, Thomas Zehetmair and Thomas Demenga.

Ruth Killius performed as soloist with the Boston Symphony Orchestra, the Residentie Orkest Den Haag, the Basler Sinfonie Orchester, the Budapest Festival Orchestra, the Wiener Kammerorchester and the Australian Chamber Orchestra.

She has also accompanied the Orchestra of the 18th Century on tour in South America and Russia.

In autumn 2005 Ruth Killius has again performed with this orchestra on a European tour.

Future engagements include among others concerts with the Kammerakademie Potsdam, the MDR Sinfonie Orchester Leipzig as well as with the Orchestra Ensemble Kanazawa.

She received invitations to major festivals including the Luzerner Festwochen, the Edinburgh International Festival, the Schleswig Holstein Musik-Festival and the Helsinki Festival.

With Thomas Zehetmair she performs sonata-programmes Viola/ Violin in all the major capitals.

Ruth Killius has been professor for viola at the Johannes Gutenberg Universität Mainz from 2001 to 2003.

Ruth Killius studied with Ulrich Koch and Kim Kashkashian. Besides playing the standard repertoire, she took part in many first performances, f. e. in Elliott Carter's Oboe Quartet with Heinz Holliger and in Brian Ferneyhough's String Trio with members of the Ensemble Contrechamps, Geneva.

From 1993 to 1996 Ruth Killius was principal viola player of the Camerata Bern.

In 1994 she founded together with Thomas Zehetmair the Zehetmair Quartet which meanwhile belongs to the most important string quartets. Their recent recording of Schumann's 1st and 3rd String Quartet received among other awards the Gramophone award (Record of the Year), the Edison Prize and the Diapason d'Or d'année.