Dimas studied law at Athens University and New York University. He first worked in a law firm on Wall Street and then the World Bank.
Since 1977 he worked in Greek politics for the New Democracy party. He has held various ministerial posts such as trade (1980-1981), agriculture (1989-1990) and industry ( 1990-1991).
From November 11th 2011 to 16th May 2012 was Foreign Minister Dimas in the transitional government of Loukas Papademos.
Career in the European Union
In March 2004, he followed Diamantopoulou by European Commissioner for Employment and Social Affairs. He then led from 2004 to 2010, the environmental department in the Commission. He was responsible for renewable energy, noise reduction, climate change, biotechnology and economics of environmental measures.
As commissioner, he pushed through that in the Lisbon agenda for competitiveness of the EU's sustainable development and environmental protection are recognized. In addition, the EU Commission has agreed in principle for environmental protection as essential for long -term prosperity.
Dimas is considered as a critic of German climate policy. So he called in February 2007 after the publication of the 4th Assessment Report of the IPCC Germany to boost efforts on climate change. Despite some efforts by Germany had lost its leading role in this area in countries such as the UK and Sweden.