Stéphane Tonnelat is a CNRS (French National Centre for Scientific Research) research fellow within the LAVUE research unit – where he is a member of the Mosaïques team – at Paris-Nanterre University. He conducts ethnographic research into various types of urban public spaces and environmental mobilizations in Paris and New York. His main fields of investigation concern urban interstices (wastelands, empty lots), parks and gardens, and subways and ferries. His current work focuses on collective composting and on movements to protect agricultural land on the fringes of the Paris region. His publications include International Express: New Yorkers on the 7 Train (Columbia University Press, 2017), co‑authored with William Kornblum (CUNY Graduate Center); and L’Art en chantier. Stefan Shankland et l’Atelier/TRANS305 (Archibooks, 2016), on the role of art on a construction site in Ivry-sur-Seine, in the inner suburbs of Paris.