William Vaessen (November 20, 1974) better known under his stage name Niels William is former singer. He's now a producer and manager.

Niels William and Studio 100Edit

Niels William is the founder of K3 and the Ketnetband. In 2002 William sold K3 to Studio 100. Later on, he moved to South-Africa and made a copy of the group named X4. Recently, he moved back to Belgium and is now again the manager of Kathleen Aerts.