Born in Barcelona, Dr. Joan Clos joined the United Nations in 2010 as under-secretary-general and executive director of UN-Habitat. He is also the secretary-general of the Third U.N. Conference on Housing and Sustainable Urban Development, Habitat III. He is a medical doctor with a distinguished career in public service and diplomacy. He was twice elected mayor of Barcelona during the years 1997-2006. He was also the minister of industry, tourism and trade of Spain from 2006-2008. He served as Spanish ambassador to Turkey and Azerbaijan prior to joining UN-Habitat.