Erik Opsahl (1960), after graduating from the University of Oslo and receiving his doctorate from the University of Tromsø, he worked at the National Archives and then at Vestfold University College (now part of the University of Southeast Norway) before he was employed at NTNU where he is a professor of medieval history. Opsahl has held several scientific and administrative positions, including being head of department, member of the editorial board of several professional journals, head of the Source Writing Commission ("Kjeldeskriftkommisjonen") at the National Archives and member of the steering committee for The Norwegian Graduate School in History 2018-2020. He has participated in several scientific research projects. Opsahl has taken part in the Code of 1274-project on legislation and governance in the Middle Ages since 2014 and is now (2021) in the process of completing together with colleagues the interdisciplinary research project MEDHEAL600 which is funded by the Research Council. He has been the author /co-author and editor of several books and has written a number of articles in his fields of expertice. Opsahl, together with his co-authors, won the Brage Prize for best non-fiction book in 2003 for the multi-volume work Norwegian immigration history. He is a member of The Royal Norwegian Society of Sciences and Letters The Academy (DKNVS) and The Royal Danish Society for the History of the Fatherland.