Prior to joining UNECE, Mariyasin was the Resident Representative of the United Nations Development Programme (UNDP) in Armenia, leading a team of 120 people. From 2011 to 2016, he was the Regional Partnership Advisor and Team Leader in the UNDP’s Bureau for External Relations and Advocacy covering Eastern and Western Europe, based in Istanbul. In this function, he led a team that supported UNDP’s partnerships with new development donors and partners in the region, including strategic partnerships with Czech Republic, Kazakhstan, Romania, Russia, and Slovak Republic.
Earlier, Mariyasin had worked in the UNDP Regional Support Center in Bratislava, the Regional Bureau for Europe and the CIS at UNDP headquarters in New York, and the UNDP Country Office in Moscow.
Mariyasin holds a PHD in Economics from the Moscow State University, an MA in Public Administration from New York University (Robert F. Wagner Graduate School of Public Service), as well as a degree in public administration from the Moscow State University, and in international economics from the Russian Foreign Trade Academy.