Juncker, Jean-Claude, 1954–, Luxembourg political leader. A member of the Christian Social People's party, he was first elected to the Chamber of Deputies in 1984. Juncker served as minister of labor (1984–99) and minister of finance (1989–2009), becoming prime minister in 1995 when Jacques Santer became president of the European Commission. Juncker was a principal architect of the Treaty of European Union (1992, Maastricht Treaty) and later headed the Eurogroup of eurozone finance ministers (2005–13). He resigned as premier in 2013 after a scandal involving the country's intelligence service, over which he had oversight. In 2014 he was elected to succeed José Manuel Barroso as European Commission president.
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