Borna Fuerst-Bjeliš is a professor at the University of Zagreb (Croatia). Her research interests are mainly focused on borderlands areas, spatial perceptions and spatial (regional) identities, environmental history and landscape change, including the development of methodologies of research. Since 2016 she is the member of the Steering Committee of the IGU Commission on Marginalization, Globalization and Regional and Local Response. She has been also serving as the vice-president of the European Society for Environmental History (2017–19). She has co-authored 6 textbooks, edited 3 books and authored or co-authored more than 90 papers, among which 56 peer reviewed scholarly book chapters and research journal articles. Walter Leimgruber is an emeritus professor of the University of Fribourg (Switzerland) where he taught human and regional geography from 1982 to 2009. He presided the Swiss Geographical Society and Association of Swiss Geographers (1987–1989) and was chair of the IGU Commission on Evolving Issues of Geographical Marginality in the Early 21st Century World (2000–2004). His research focused on boundaries and transborder relations and on mountains and marginal regions. He has authored or co-authored 11 books, 47 book chapters and 79 articles.