Marco Clausen is social activist, master of philosophy, history and political science.His main area of engagement is a sustainable and resilient urban development. He co-founded the non-profit organization “Nomadisch Grün” (Nomadic Green), which aims at transforming abandoned urban spaces into social and ecological gardens and co-initiated Prinzessinnengarten – a place dedicated to urban agriculture, environmental learning, and neighborhood participation at Moritzplatz in Berlin-Kreuzberg. Prinzessinnengarten is also a home for Nachbarschaftsakademie (the Neighborhood Academy) – a self-organized open platform for urban and rural knowledge sharing, cultural practice and activism.