His major projects include CDs with repertoire for tenor saxophone, the Aurelia Saxophone Quartet, The Four Baritones and his collaboration with Ronald Moelker and many other varied musicians from accordion to harp to string quartet.
Highlights of his career are his Solo tenor saxophone tour Australia-New Zealand 2010. He has played on tour with Valeri Gergiev's World Orchestra for Peace. The theatre production Ik ben niet bang with René Groothof received the prestigious Silver Krekel Prize in 2012. In 2014 he shared the stage with esteemed colleague and friend Branford Marsalis, in Paradiso Amsterdam and in Niels' hometown Enschede.
As part of his integrity he gives back to young musicians. He has given numerous masterclasses almost everywhere in Europe as well as Japan, New Zealand, Australia, Brazil, Canada and America.