AURORA FERNÁNDEZ PER is a journalist and JAVIER MOZAS is an architect and urban planner. Both are founders of a + t architecture publishers, 1992, and editors of the architecture magazine a + t since 1992. They co-founded the research group a + t in 2011 with the aim of promoting compact cities through research and analysis. They are also authors and editors of numerous publications, including the series "Densidad sobre vivienda colectiva" [Density over collective housing].