Siniša Krznar graduated in archaeology and history at the Faculty of Humanities and Social Sciences, University of Zagreb in 2001. He obtained his MA degree in 2007, and his PhD in 2012 with the topic "Archaeological picture of late medieval cemeteries in northern Croatia", also at the Faculty of Humanities and Social Sciences, University of Zagreb.
He was employed at the Institute of Archaeology in 2007 on the project Medieval Settlement of Northern Croatia in the Light of Archaeological Sources (leader: Tajana Sekelj Ivančan, PhD). At the end of the project he continued to study medieval topics, and as a researcher participated in the projects Iron production along the Drava River in the Roman period and the Middle Ages: Creation and transfer of knowledge, technology and goods - TransFER (leader: Tajana Sekelj Ivančan) and Development and Heritage of the Military Orders in Croatia - milOrd(leader: Juraj Belaj, PhD).
His primary scientific interest is the interpretation of everyday life, identity, social status and burial customs of medieval and early modern populations through a multidisciplinary study of archaeological and anthropological material from simultaneous cemeteries.
By cooperating in the postgraduate doctoral study of archeology, organizing scientific conferences, and cooperating with museums in the organization of exhibitions, he participates in the dissemination of collected scientific knowledge.