In '95 he gave a concert with Rotterdams Philharmonic Orchestra and Stevie Wonder.
Recently he toured through Russia with the Glenn Miller Orchestra.
Finalist of the Nederlands jazzconcours '96 en winner of the Dordrecht jazz-price.
Willem Hellbreker Quartet played on the Northseajazz festival of 2001. Since then he recorded 3 cds under his own name. In 2006 he recorded a live-cd that was very well recieved.
Willem plays or has played with Stevie Wonder, Bob Brookmeyer, Bert van den Brink, John Engels, Erik Vloeimans, Hans Dulfer, Denise Janah, Deborah Carter and is currently a member of the Holland Bigband.