A historian and political scientist, Dębski returns to the post at PISM after serving as director between 2007 and 2010. From 2011 to 2016, he was the director of the Centre for Polish-Russian Dialogue and Understanding. He was also the editor-in-chief and a member of the Editorial Board of the Intersection Project and has been a member of the Polish-Russian Group for Difficult Matters since 2008. He has served as editor-in-chief of the Russian-language quarterly Evropa and the bi-monthly Polish Diplomatic Review. Dębski is the author of Między Berlinem a Moskwą. Stosunki niemiecko-sowieckie 1939–1941 ("Between Berlin and Moscow: German-Soviet Relations, 1939-1941"), which won a Klio and an award from Przegląd Wschodni (Eastern Review), as well as articles and collections of sources on diplomatic history. His key areas of expertise include Polish foreign policy, external policy of the EU, Russian foreign policy, German-Russian relations, NATO and global security, and the history of diplomacy. He earned a PhD in history from Jagiellonian University in 2002.