G. Thomas was appointed Deputy Director General in the Directorate-General for Energy in September 2014.  He is a member of the Steering Board of the European Fund for Strategic Investments (EFSI).
Prior to his current assignment G. Thomas had professional assignments as: Director for Finance and cooperation with EIB Group, EBRD and IFIs in the Directorate-General for Economic and Financial Affairs (DG ECFIN), member of the EIB and EIF Board of Directors and observer at the EFSF Board (2009-14); Head of cabinet of Joaquin Almunia, Commissioner for Economic and Monetary Affairs (2006-2009); Head of unit - free movement of capital and financial integration in the Directorate-General of Internal Market and Services (DG MARKT) (2004-2006); Deputy Spokesman for Commission President Romano Prodi (2003-2004) and Spokesman for economic and monetary affairs under Commissioner Pedro Solbes (1999-2004); Head of Guarantee Operations in the European Investment Fund (1997-1999); Economist in DG ECFIN dealing with pension system reform policy (1995-1997), international financial issues (1993-1995), regional policy (1992-1993) and financial integration issues (1990-1992); Deputy Manager international fixed-income department Yamaichi Intl, London (1987-1990).

He has studied economics, business administration and international relations in Athens, London and Brussels.