In 1997 he was appointed Political State Secretary at the Ministry of Foreign Affairs[2] for a period of almost two years.

His father, Gyula Eörsi was a law professor, an author of several books and a major contributor to UN Convention on Contracts for the International Sale of Goods.

Eörsi's started his career as in house legal counsel to a Hungarian state company "KOMPLEX Export-Import" in international trading.

From 2015 until 2017 Eörsi was the senior advisor to the Secretary General and the Head of Admin, Finances and HR at the Community of Democracies in Warsaw.

Chairperson of the Foreign Affairs Committee (1994-1997) Member, Parliamentary Assembly of the Council of Europe (1994-1997,1998-2010) State Secretary, Ministry of Foreign Affairs (1997-1998) Vice-president, Liberal International (2001-2006) Leader, ALDE Group Parliamentary Assembly of the Council of Europe (2002-2009) Bureau Member, ELDR Party (2002-2009) Chairperson, European Affairs Committee (2004-2010) Floor leader of SZDSZ parliamentary group (2007-2008) He joined Democratic Coalition in January 2012.

[4] Member of National Council – Democratic Coalition Party, Hungary (2012-) Senior Foreign Policy Advisor to the President of the Democratic Coalition Party (2016- ) Senior Political Advisor to Klára DOBREV, Vice-President in the European Parliament.

[7] His wife, Katalin Jemnitz is a biologist at the Chemical Research Centre[8] of the Hungarian Academy of Sciences.