In 1983 Ivo-Jan joined the Medici String Quartet, with whom he has toured worldwide made more than 40 recordings, including an acclaimed complete cycle of the Beethoven Quartets. He has also given many recitals with his duo partner Simon Marlow and concerto performances, most notably with the Philharmonia Orchestra. His solo recordings include the Sonata by Max Reger on ASV and the complete viola works of Arnold Bax, recently released on the Koch Schwann label. He is professor of viola at the Royal College of Music.