He obtained doctorates at the economics faculty of Saint Petersburg State University and the political science department of the University of California at Berkeley in 2012. He has been a post-doctoral researcher at the Centre for European Economic Research (ZEW) in Mannheim, Germany, a visiting researcher at the Social Science Research Center Berlin (WZB), the Humboldt University of Berlin, the Higher School of Economics in Moscow, and the University of Haifa. Grigoriadis interned at the World Bank's Moscow office and at the EU embassy to Moscow.