As an independent promoter, agent and label manager, Koen has been active in local and European undergrounds for two decades.
In 2005, he co-founded the independent label Subroutine Records, which has released music of over 40 Dutch acts.
His booking platform Yugofuturism introduces, exchanges and promotes acts from CEE and Russia (e. g. Repetitor & Shortparis) to The Netherlands and vice versa (e.g. The Homesick & The Sweet Release of Death).
He is curator at the festival Welcome to the Village and promoter at WORM Rotterdam and OCCII Amsterdam. In 2016 he initiated Van Onderen, a 24hr festival in illustrious Paradiso Amsterdam highlighting the Dutch underground.