He joined the Christian Social People's Party in 1974. He studied law at the University of Strasbourg, graduating with a master's degree in 1979; although he was sworn into the Luxembourg Bar Council in 1980, he never practised as a lawyer. Following Juncker's graduation from the University of Strasbourg, he was appointed as a Parliamentary Secretary. He later won election to the Chamber of Deputies for the first time in 1984 and was immediately appointed to the Cabinet of Prime Minister Jacques Santer as Minister of Labour. In the second half of 1985, Luxembourg held the rotating presidency of the Council of the European Communities, permitting Juncker to develop his European leadership qualities as chair of the Social Affairs and Budget Councils. It was here that Juncker's pro-Europe credentials first emerged. Shortly before the 1989 election Juncker was seriously injured in a road accident, spending two weeks in a coma. He has stated that the accident has caused him difficulty with balancing since. He nonetheless recovered in time to be returned to the Chamber of Deputies once more, after which he was promoted to become Minister for Finance, a post traditionally seen as a rite of passage to the premiership of the country. His eventual promotion to Prime Minister seemed at this time inevitable, with political commentators concluding that Santer was grooming Juncker as his successor. Juncker at this time also accepted the position of Luxembourg's representative on the 188-member Board of Governors of the World Bank. Juncker's second election to Parliament, in 1989, saw him gain prominence within the European Union; Juncker chaired the Council of Economic and Financial Affairs (ECOFIN), during Luxembourg's 1991 presidency of the Council of the European Communities, becoming a key architect of the Maastricht Treaty. Juncker was largely responsible for clauses on Economic and Monetary Union, the process that would eventually give rise to the Euro, and in particular is credited with devising the "opt-out" principle for the UK to assuage its concerns. Juncker was himself a signatory to the Treaty in 1992, having, by that time taken over as parliamentary leader of the Christian Social People's Party. Juncker was re-elected to the Chamber in 1994, maintaining his ministerial role. With Santer ready to be nominated as the next President of the European Commission, it was only six months later that Grand Duke Jean approved the appointment of Juncker as Prime Minister on 20 January 1995, as part of a coalition with the Luxembourg Socialist Workers' Party. Juncker relinquished his post at the World Bank at this time, but maintained his position as Minister for Finance.