He graduated from the Universidad Autónoma de Barcelona with a degree in medicine and pursued his studies in the Sant Pau Hospital of Barcelona. During the political transition he took part in anti-Franco movements for the profession and the modernization of the healthcare services. He worked in the Analysis and Healthcare Programs Centre with a group of doctors who defended the political transformation of the country as a means for recovering professional dignity. Once he graduated in medicine and after having worked for some time as an anaesthetist, he decided to change his professional career and moved into epidemiology, community medicine and healthcare resources management. He studied his specialty at the University of Barcelona, in the United States and in Edinburgh. Between 1981 and 1991 he was the chairman of the Spanish Society of Epidemiology and Healthcare Administration.
Political career
Continuing this process of involvement and dedication to healthcare management, he joined the Barcelona municipal government as director of healthcare services. In 1993 he was elected councillor on the Barcelona Council for the PSC. Achieving efficient municipal management and “city making” have been two constant features that have marked his municipal career. He thus directed the regeneration project for the neighbourhood of Ciutat Vella, following a comprehensive plan that combined planning intervention, financial and social investment and facilities strengthening in order to open up this district to the city and to improve the quality of life for its residents. In 1999, the Royal Institute of British Architects awarded the City of Barcelona the Royal Gold Medal personified in the men who have driven the transformation of the city: Narcís Serra, Pasqual Maragall and Joan Clos. As second deputy mayor with direct responsibility for organisation, economy and treasury, he started a thorough reorganisation of the economic and financial structure of the City Hall with the aim of reaching budgetary stability and, at the same time, establishing a consistent investment programme to tackle the period after the Olympic Games with new projects. at the UN in New York City His mayor’s office was enhanced by the design, preparation and holding of the first Universal Forum of Cultures, held in Barcelona during the summer 2004 and by the consequent development of the area of Besós and Diagonal Mar, a project of urban development ten times as big as the one Barcelona went through for the Olympic Games in 1992. The project 22@, a new technological neighbourhood built on the old Poblenou, together with the reorganisation of La Sagrera, are another two examples of his urbanistic activities as Mayor of Barcelona. In September 2006, the Spanish President José Luis Rodríguez Zapatero appointed Clos as a Minister of Industry, Tourism and Trade. In July 2008, he became the Spanish Ambassador in Turkey and Azerbaijan. Since 18 October 2010, he is the Executive Director of the United Nations Human Settlements Programme, UN-HABITAT, and Under Secretary General of the United Nations. In 2012 the Secretary General of the United Nations, Mr. Ban Ki-moon appointed Clos as a Secretary-General of the Habitat III Conference and to act as a focal point on behalf of the United Nations.
On February the 4th 2006, a local police was seriously injured during the eviction of an illegal party held in a squatted theatre owned by the Barcelona city council. The initial version of the events given by Joan Clos to the press described the policeman being hit in the head by a flower pot thrown from one of the windows of the theatre and suffering a vertebra fracture as a result. This version was later changed to fit the official version given by the police, two of whom were later found to have been tortured the detainees and to have fabricated evidence and lied in court in a different case. Five young people were condemned to up to five years in prison solely based on the second version of these events. One of the condemned, poet Patricia Heras committed suicide during prison leave. These events were later described in detail in the award-winning documentary Ciutat morta.