Marlen Rein is a diplomat with the Ministry of Foreign Affairs of Estonia, currently serving as the Estonian Subject Matter Expert at the Research and Lessons Learned Division of NATO Energy Security Centre of Excellence (ENSEC COE), where she focuses on the linkage between energy security and cyber security, among other topics. Prior to joining the ENSEC COE, she was posted to the Embassy of Estonia in Madrid, dealing with bilateral political and economic relations. She also worked at the Permanent Representation of Estonia to the European Union, where she handled development cooperation and negotiations over the budget for EU external action, in addition to holding several positions at the Ministry. Before beginning her diplomatic career, she worked as a free-lance journalist for an Estonian daily newspaper. Ms Rein received her MA in East Asian Economy and Society from the University of Vienna in Austria.