Co-editor, with Antony Polonsky, of Jewish Self-Government in Eastern Europe, Polin, 34 (2022), and, with Jerzy Tomaszewski, of Sources on Jewish Self-Government in the Polish Lands from Its Inception to the Present (2022). He is chair of the Institute for Polish-Jewish Studies and secretary of the European Association for Jewish Studies. He has held research fellowships and visiting teaching positions at University of Pennsylvania, University of Oxford, the Hebrew University of Jerusalem, Dartmouth College, Potsdam University, Vilnius University, and the Jagiellonian University Kraków. Author of The Jews in Poland and Russia, 3 vols. (Littman Library, 2010–12), also published in an abridged version: The Jews in Poland and Russia: A Short History (2014). In 2012 The Jews in Poland and Russia was awarded the Pro Historia Polonorum prize of the Polish Senate for the best book on the history of Poland in a non-Polish language written in the previous five years. Holds honorary doctorates from the University of Warsaw (2010) and the Jagiellonian University (2014). In 2011 he was awarded the Officer’s Cross of the Order of Merit of Polonia Restituta and the Officer’s Cross of the Order of Merit of Independent Lithuania.