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 fiercely independent label Subroutine Records, which has released over 50 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 festival Welcome to the Village and promoter at WORM Rotterdam and OCCII Amsterdam. In 2016 he initiated Van Onderen, a 24hr festival in the illustrious Paradiso Amsterdam highlighting the Dutch underground.