The creator of buildings that stand out as surrealistic marvels amid the skylines of America, Europe, and Asia, Rem Koolhaas, along with his Office for Metropolitan Architecture (OMA), is justly considered as one of the leaders of contemporary architecture. This book, the first critical monograph on the work of Rem Koolhaas and OMA, does more than just describe projects and buildings: It places Koolhaas’s career in a cultural context that allows the reader to better understand the creative process of modern architecture. The works considered are presented in chronological and thematic order, thus retracing the career of Koolhaas from his student days to his neo-avant-garde experimentation at the end of the 1970s and finishing with his most recent works in Porto, Seoul, and Beijing. The individual projects are analyzed from conception to construction, paying particular attention to the conceptual and technical reasons for choices of materials and configuration. Overall, the book addresses the theoretical formulations of Koolhaas, offering a reflection on the fundamental principles of the contemporary architectural project.