Fifty years ago a landmark conference at Harvard University established urban design as a distinct architectural and planning practice. Today, with the world's urban population surpassing three billion people, urban design has become more crucial than ever. Indeed, the concerns that initially brought leading architects and city planners together-including concerns over sprawl, pollution, and aging infrastructure-have only intensified over the past half century. In Urban Design, Alex Krieger and William S. Saunders have assembled prominent figures in architecture, planning, and landscape design to look back on the evolution of the discipline of urban design; assess the current state of the field; and anticipate the challenges posed by the unprecedented rate of urbanization, particularly in the developing world, and how the profession will need to adapt in order to confront them.