When Koen co-founded Waterstudio in 2003 it was the first office 100% focused on floating architecture and urban planning beyond the waterfront. "Blue is Better" is the back bone of his vision and concepts and stands for the strong belief that cities can improve their performance by using water for space, flexibility and safety. He is the co-author of the book FLOAT! (Flexible Land On Aquatic Territory) and shares his ideas through lectures around the globe. He advices municipalities and governments who want to take their first step into the water to combat the effects of climate change and growing urbanization. In 2007 he was chosen as nr. 122 on the Time Magazine list of most influential people in the world due to the worldwide interest in water developments. The French magazine Terra Eco chooses him as one of the 100 green persons that will change the world in 2011. In 2015 he is selected by an internationals jury as one of fifty young innovators of the 21st century in the book 50Under50.