He has written widely on the economic, social, and cultural history of the Jews in the Polish-Lithuanian Commonwealth. His monographs: Living Together: The Jewish Quarter of Poznań in the Seventeenth Century, Jerusalem 2003 (written in Hebrew), and Money, Power, and Influence in Eighteenth Century Lithuania: The Jews on the Radziwiłł Estates, Stanford University Press 2016. He received an NEH fellowship as Senior Scholar at the Center for Jewish History in New York in 2012/3 and was a member of the core academic team responsible for the award-winning POLIN Museum for the History of Polish Jews which opened in Warsaw in 2014.