In this sweeping study, one of the world's leading thinkers about the urban environment traces the often anguished relation between how cities are built and how people live in them, from ancient Athens to twenty-first-century Shanghai. Richard Sennett shows how Paris, Barcelona and New York City assumed their modern forms; rethinks the reputations of Jane Jacobs, Lewis Mumford and others; and takes us on a tour of emblematic contemporary locations, from the backstreets of Medellín, Colombia, to the Google headquarters in Manhattan. Through it all, he shows how the 'closed city' - segregated, regimented, and controlled - has spread from the global North to the exploding urban agglomerations of the global South. As an alternative, he argues for the 'open city,' where citizens actively hash out their differences and planners experiment with urban forms that make it easier for residents to cope. Rich with arguments that speak directly to our moment - a time when more humans live in urban spaces than ever before - Building and Dwelling draws on Sennett's deep learning and intimate engagement with city life to form a bold and original vision for the future of cities.