Homelessness--the state of having no home--is a growing global problem that requires local discussions and solutions. In the face of the coronavirus pandemic, it has noticeably become a collective concern. However, in recent years, the official political discourse in many countries around the world implies that poverty is a personal fault, and that if people experience homelessness, it is because they have not tried hard enough to secure shelter and livelihood. Although architecture alone cannot solve the problem of homelessness, the question arises: What and which roles can it play? Or, to be more precise, how can architecture collaborate with other disciplines in developing ways to permanently house those who do not have a home? Who's Next? Homelessness, Architecture, and Cities seeks to explore and understand a reality that involves the expertise of national, regional, and city agencies, nongovernmental organizations, health-care fields, and academic disciplines. Through scholarly essays, interviews, analyses of architectural case studies, and research on the historical and current situation in Los Angeles, Moscow, Mumbai, New York, São Paulo, San Francisco, Shanghai, and Tokyo, this book unfolds different entry points toward understanding homelessness and some of the many related problems. The book is a polyphonic attempt to break down this topic into as many parts as needed, so that the specificities and complexities of one of the most urgent crises of our time rise to the fore.