Erik-Jan de With graduated with distinction from the Royal Conservatory of The Hague in 2005 under the tutelage of Leo van Oostrom  and David Kweksilber.

He is co-founder of Ensemble Klang formed in 2003. Presenting innovative programmes, their commissioning of work from some of the most exciting composers working today, and the inception of their own record label has seen them quickly rise to become "one of the top ensembles " (NRC Handelsblad) in the Netherlands’ rich contemporary music scene.

Dedicated to a new generation of composers, Ensemble Klang continue to build a repertoire of bold, uncompromising works. The unique yet versatile instrumentation - ranging from a quiet, fragile intimacy to the punchy power of a big-band - has attracted composers including Heiner Goebbels, Tom Johnson, Martijn Padding, Phill Niblock, Jacob ter Veldhuis, Kate Moore, Jan-Bas Bollen, Oscar Bettison and Peter Adriaansz.

His quartet The Hague Saxophone Quartet (formerly Python saxophone quartet) have won the prestigious Concours Vandoren, and have worked with artists from many different backgrounds including; ao Ilya Pfeiffer (poet), the Gents, Johan Zomer, Jeroen Willems (actor), Paul Koek (theater), Hartley Hall (filmmaker) and Marije Nie (Tap Dancer). The world renowned Dutch composer Louis Andriessen wrote the opera Inanna for the quartet.

Erik-Jan performs regularly across the Netherlands and internationally with many Dutch orchestras and ensembles. Cities include; New York, Princeton, Valencia, Madrid, Ghent, Antwerp, Brussels, Paris, Berlin, Vienna, Cologne, London, Cambridge, Brno, and Prague.

Under his leadership as founder and artistic director the Westland Saxophone Festival has grown into one of the largest saxophone festivals in the Netherlands held every two years.