For more than 20 years, she collaborated with the pianist Ronald Brautigam and the mezzo-soprano singer Christianne Stotijn [nl].

[4] Born in Mijdrecht on 16 December 1966, Isabelle van Keulen was raised in an art-loving home in which her father was a painter and her sister a flautist.

From 1979, she continued her studies at Alkwin College in Uithoorn and from 1984 at the Amsterdam Conservatoire under Davina van Wely [nl].

[1] In the early 1990s, she performed frequently as a concert violist, in 1995 she founded the Isos Quartet as first violinist, and in 1996 she founded the Delft International Music Festival which she directed until 2006.

[3] Van Keulen has taken a special interest in performing the works of less recognized modern composers, including Alfred Schnittke, Sofia Gubaidulina, Witold Lutosławski, Allan Pettersson, Hans Henkemans, Erkki-Sven Tüür and Theo Loevendie.