Yannos was a member of the National Parliament in Greece from 1988-2007, served as Minister of National Defence, Minister of National Economy and Finance, Minister of National Economy, Alternate Minister of National Economy, Minister of Trade and Deputy Minister of National Economy.
Previously, he worked at the OECD in Paris, served as Member of the European Parliament and Advisor to the Greek Prime Minister on European Economic Community Affairs and Integration.
He was elected as Chairman of the Board of Governors of the European Bank for Reconstruction and Development (EBRD) in London, UK. He was also Visiting Senior Fellow in the Hellenic Observatory within the European Institute at the London School of Economics and Political Science and Bosch Public Policy Fellow at the Transatlantic Academy in Washington, USA.
He studied Economics at the Universities of Athens (Greece) and Wisconsin (Madison, USA), History at the EcolePratique des Hautes Etudes -Sorbonne (Paris, France) and obtained his PhD degree in Economics at the University of Cambridge (UK).