United Nations indicates that almost 200,000 people are urbanizing on this planet every day. This means we, as a global species, need to build a new or expanded city of a million inhabitants every week. The question becomes: Where do these new urban dwellers go in the dense, vertical city or the dispersed, horizontal city? There are many that believe that the sustainability benefits of increased density in cities (e.g., better land use, reduction of suburban infrastructure, reduced vehicle travel time, etc.) are considerable. However there are implications to this—not least the social implications of people living and working in denser proximity. This panel brings together professionals with varied perspectives—architects, urban planners, engineers, and social scientists—to fully present and then debate the issues.