D. Asher Ghertner is an associate professor in the Department of Geography and director of the South Asian Studies Program at Rutgers University. His current research project, “Bad Air: The Cultural Politics of Breathing in ‘the World’s Most Air-Polluted City’,” builds on ethnographic, legal, and archival research to examine how templates of segregation are being remapped onto the three-dimensional space of the atmosphere, and how class- and caste-based exclusions are being reimagined in the wake of the WHO's declaration that Delhi’s air the worst in the world. His first book, Rule by Aesthetics: World-Class City Making in Delhi (Oxford University Press, 2015), was an ethnography of mass slum demolition, charting the rise of a mode of governing space premised on urban aesthetics.