Stephan Dusil's academic focus is on medieval and modern legal history as well as on private law. He works on Germanic legal history and history of canon law. He is especially interested in legal knowledge in the Middle Ages and the interaction between learned law and the autochthonous legal cultures. He is also involved in current law, especially in German and Swiss Private Law and the Comparison of Law. Stephan Dusil passed the First and the Second Legal State Exam in Germany (2000, 2006). He also studied History (M.A., 2001). He received his Habilitation at the University of Zurich in 2016 with the venialegendi for Rechtsgeschichte, Privatrecht, Kirchenrecht and Rechtsvergleichung.

His PhD-thesis on the proliferation of town laws in the Late Middle Ages was published in 2007 ("Die Soester Stadtrechtsfamilie. Mittelalterliche Quellen und neuzeitliche Historiographie"). Before coming to Leuven, he was a Mellon Fellow at the Pontifical Institute of Mediaeval Studies in Toronto, Canada (Licence in Medieval Studies, 2010) and a Postdoctoral Research Assistant at the University of Zurich. He was involved in the interdisciplinary research project "Changing Medieval Orders of Legal Knowledge" until December 2015 (together with Prof. Dr. Andreas Thier).

Since 2015, he has been member of theAdvisory Board of the "Stephan Kuttner Institute of Medieval Canon Law" (Yale University, New Haven, USA). A podcast of his "Antrittsvorlesung" as "Privatdozent" at the University of Zurich (3 April 2017) can be seen here. He is also "professeur invité" at Université Catholique de Louvain (Louvain-la-Neuve).