Kęsţutis Sadauskas, was born in 1969 in Lithuania. In 1994 graduated Vilnius University where he obtained Master Degree in International Relations at the Institute of Political Science and International Relations and Master Degree in Geography at the Faculty of Natural Science. He started his professional career in September 1993 at the Ministry of Foreign Affairs of the Republic of Lithuania, Vilnius, in the sector of Government's foreign relations, dealing with Lithuanian policies on Council of Europe, Human Rights, UN, OSCE, NATO. At the end of 1996, Kęsţutis Sadauskas joined the Permanent Mission of Lithuania to the United Nations, New York, as Deputy Permanent Representative-Counselor responsible for general political affairs, UN Security Council activities and reform, international security. At the beginning of 2000, he went back to the Ministry of Foreign Affairs of Lithuania, Vilnius, as Head of Unit of the EU Department, and later as Director, responsible for Lithuanian policy towards EU, EU accession negotiations of Lithuania, Convention of Future of EU. In August 2002, he joined the Permanent Representation of Lithuania to EU, Brussels, as Minister-counsellor responsible for coordination of EU accession negotiations of Lithuania, general coordination of activities in the COREPER, negotiations of Financial Perspectives 2007-2013. In September 2006, Kęsţutis Sadauskas was appointed Head of the Representation of the European Commission in Vilnius, Lithuania. In February 2010, he joined the European Commission as a member of the Cabinet of Commissioner Šemeta and from 1st of April of the same year, he became the Head of the Cabinet.