Árni Daníel Júlíusson is a historian affiliated with the Reykjavík Academy and, since 2017, with the University of Iceland. Árni Daníel´s research interests lie in the complex interaction between the environment, human subsistence and the effects of social stratification. Among these effects can be counted social conflict and the activities of social movements. His field of research is pre-industrial peasant farming society, primarily in Iceland. Árni Daníel studied at the University of Iceland and, from 1988, contributed to a major publishing project, the Icelandic Historical Atlas (3 vols., 1989-1993). He then initiated his Ph.D. studies, graduating from the University of Copenhagen in 1997 with a Ph.D. thesis titled „Bønder i pestens tid “, or “Peasants in the time of the Plague”, which was an analysis of Icelandic peasant farmer society 1300-1700. From 1997 Árni Daníel was active in the establishment of the Reykjavík Academy, a collective of independent scholars of the arts and humanities in Reykjavík, and has been an active member ever since. In 2005 he began work with others on the Agricultural History of Iceland, which appeared in four vols. 2013. Árni Daníel wrote vols. 1 and 2. Árni Daníel is active in several research projects concerning environmental history, including the international transdisciplinary research project Reflections of Change: The Natural World in Literary and Historical Sources from Iceland ca. AD 800 to 1800 (2017-2020) funded by The Swedish Foundation for Humanities and Social Sciences. His latest publication is Miðaldir í skuggsjá Svarfaðardals, a book which deals with the medieval history of Svarfaðardalur with an interdisciplinary methodology, using archaeology, environmental history and conventional historical sources to paint a nuanced picture of the history of this region 800-1500 AD.