From 1953 to 1954, Whitaker was the chairman of the Catholic University Youth of Brazil, formed by Catholic University students from all over the country. He then served on the strategy group of São Paulo governor Carvalho Pinto, which spanned from 1959 to 1963. He was also head of land reform planning during the João Goulart administration. Following the coup d'état that overthrew Goulart, he joined the opposition movement against the military dictatorship. From 1965 to 1966, he was an advisor of the National Conferences of Bishops of Brazil at the First Joint Pastoral Plan. In 1966, fleeing political persecution in the country, he went into live in exile with his wife and four children. Until his return to Brazil in 1981, Whitaker lived and worked in France and Chile as a researcher and advisor for the Catholic Committee Against Hunger, the United Nations Educational, Scientific and Cultural Organization, and the United Nations Economic Commission for Latin America and the Caribbean, among other organizations. From 1982 to 1988, he served as an advisor for the Archdiocese of São Paulo and the CNBB. In 1988, he was elected to serve in the Municipal Chamber of São Paulo for the Workers' Party. There, he acted as the majority leader for then mayor Luiza Erundina. In 2001, Whitaker helped organizing the World Social Forum. In 2006, he received the Right Livelihood Award, an annual prize given since 1980 to support people who not only dedicate themselves to social justice and the environment, but who live according to those principles. The prize – 220,000 euros – is shared among three other winners, and was awarded in December of that same year. During the local elections of 2008, he helped organizing the Ficha Limpa project, which aims to prevent the candidacy to public offices by citizens responding to legal actions. In addition to being part of the Advisory Board of WikiLeaks, Whitaker is also a founding member of the nongovernmental organizationTransparência Brasil, which is affiliated to the Transparency International and aims to fight against corruption in Brazil. He also is a member of the World Future Council. The World Future Council brings the interests of future generations to the centre of policy making.
Publications
1992: O que é vereador?
1994: Idéias para Acabar com os Picaretas
2005: Desafio do Fórum Social Mundial: um Modo de Ver
2006: Towards a New Politics. What Future for the World Social Forum?
2007: Eleições, Cidadania e Redes
2007: Das Weltsozialforum: Offener Raum für eine andere Welt