His previous appointments included posts at the University of Warsaw, the University of Leiden and the European University in Florence. Zielonka teaches European Politics and Society and directs a large international project funded by the European Research Council on the Media and Democracy in Central and Eastern Europe. He has produced 17 books, including 5 single-author monographs, and more than 100 articles and chapters. His work has been published in English, Polish, Russian, Chinese, Slovak, German, Italian, Spanish and French. His main areas of expertise are in Comparative Politics, International Relations and Political Theory.