Maartje works on the history of 16th and 17th century Europe and the Mediterranean, with a particular focus on the Venetian Republic and urban and political history. She finished her PhD at the UvA in 2007; her dissertation was published as Trading Places: The Netherlandish Merchant community in Early Modern Venice (2009, Brill). She was a postdoctoral researcher at Leiden in 2008-2009, and has been working at the UvA since then. Maartje was awarded an NWO Veni grant in 2011 and has held visiting appointments at Birkbeck, University of London (2011) and Columbia University, New York (2013) as well as research fellowships at (among others) the Netherlands Institute for Advanced Study (2018) and the Institute for Advanced Study, Princeton (2019). In the last few years she has published articles in eg. the Journal of Modern History and Journal of Early Modern History, and co-edited volumes on graffiti (Tekens aan de wand: graffiti door de eeuwen heen; special issue Tijdschrift voor Geschiedenis in 2018) and Early Modern diplomacy (Cross-Cultural Diplomacy and Diplomatic Intermediaries in the Early Modern Mediterranean, special issue Journal of Early Modern History in 2015).