Political scientist, historian. Head of Department of Central and Eastern Europe and Post-Soviet Research in the Institute of Political Studies Polish Academy of Sciences. Deputy Director of the Warsaw Rising Museum (2004-2014 and since 2016). 2014-2016 vice-president of the Institute of National Remembrance, 2011-2017 and since 2021 Member of the Executive Board of the Platform of European Remembrance and Conscience (PEMC), 2019-2021 Chairman of the Supervisory Board of PEMC.
Lecturer in Collegium Civitas university (2002-2014) and Graduate School for Social Research (since 2020). Teaching and research areas: Central-East European transition, regional cooperation in the East-Central Europe, the break-up of Czechoslovakia, Czech-Slovak relations, Policy of remembrance.

Author of „Aksamitny rozwód. Rola elit politycznych w procesie podziału Czechosłowacji” („The velvet divorce. The role of political elites in the division of Czechoslovakia process” 2007) and „Pamięć Polski, pamięć sąsiadów. Pamięć Europy” (“Memory of Poland, memory of neighbours. Memory of Europe” 2020). Co-author of „1989 – Jesień Narodów” („1989 – The Autumn of Nations”, Polish edition 2009, Romanian edition 2013, Hungarian edition 2014, English edition 2020, second Polish edition, extended and amended 2021, Czech edition 2022), “Inicjatywa Trójmorza z perspektywy jej uczestników” (“The Three Seas Initiative from the perspective of its participants”, 2020) and „Chcieliśmy być wolni. Powstanie Warszawskie 1944” („We wanted to be free. Warsaw Rising 1944”, 2022).