Born in Madrid in 1941, Guillermo De la Dehesa studied Law and Economics at the Universidad Complutense of Madrid. Later, he became a Government Economist in 1968 and served at the Ministries of Trade, Industry and Energy and Economy and Finance. In these ministries and between 1978 and 1988, he was appointed, successively, Director General of Trade, Secretary General of Industry and Energy, Secretary General of Trade, Secretary of State of Economy and Finance and Secretary of the Commission for Economic Affairs of the Council of Ministers. He also worked at the Bank of Spain as Director for International Affairs and Foreign Reserves Management, between 1980 and 1983.