What is OMA provides a clear insight into the role and significance of Rem Koolhaas and the Office for Metropolitan Architecture. Authors of international repute from beyond the province of architecture examine OMA's work in the light of social and economic developments. The many facets of Koolhaas come under review: his take on architectural theory and the conceptual apparatus he employs, his vision of urbanism and the contemporary city, the designs put into practice by OMA and the research projects of the AMO think tank, which exist outside the immediate boundaries of architecture. This book paints an intelligent picture of the sheer range of OMA's architecture and of Koolhaas's seminal role in the architectural world.