As an independent promoter, booking agent and label manager, Koen has been active in diverse roles in Dutch and European underground for almost two decades. In 2005 he co-founded the label Subroutine Records, which released music of over 40 Dutch acts. He started booking platform Yugofuturism, which introduces acts from Central and Eastern Europe (e.g. Repetitor, Bernays Propaganda) to the Netherlands and vice versa (e.g. The Homesick, WOLVON). He is curator for Welcome to the Village festival and regularly books nights in WORM Rotterdam and OCCII Amsterdam. He is head of communication for Rotterdam art laboratory/music venue Roodkapje. Last year, he initiated 24-hour festival Van Onderen – with over 80 acts in Paradiso Amsterdam – highlighting Dutch underground.