Constantin Petcou is a Paris-based architect whose work stresses the intersection between architecture, urbanism and semiotics. He has co-founded the atelier d’architecture autogérée (aaa), a collective that conducts explorations, actions, and research concerning socio–political practices in the contemporary city. aaa acts through “urban tactics”, encouraging inhabitants to self-manage disused urban spaces, engage in nomadic and reversible projects, and initiating interstitial resilient practices. aaa has been laureate of Zumtobel Prize for Sustainability and Humanity 2012, Curry Stone Design Prize 2011, the European Prize for Urban Public Space 2010 and the Prix Grand Public des Architectures contemporaines en Métropole Parisienne 2010. Petcou has co-edited Urban Act: A Handbook for Alternative Practice (2007) and Trans-Local-Act: Cultural Practices Within and Across (2010).