Walter Leimgruber's research interests include boundaries and transborder relations, regional development and inequality issues. He graduated and obtained his PhD from the University of Basle, Switzerland, where he worked from 1975 to 1980. From 1982 till his retirement in 2009 he taught human geography at the University of Fribourg, Switzerland. He has authored and edited/co-edited 7 books. He was President of the Association of Swiss Geographers (ASG) 1987 to 1989 and Chair of the Swiss National Committee IGU 1989 to 1992. 2001 to 2004 he directed the Centre d'Etudes, de Recherche et de Documentation sur l'Afrique à Fribourg (CERDAF) He chaired the IGU Commission on Evolving Issues on Geographical Marginality in the Early 21st Century World from 2000 to 2004 and has been its secretary since. Changyi David Chang is currently the Chair Professor, Environmental and Development Program, Dharma Drum Institute of Liberal Arts. He was the chair of IGU Commission on Islands (20062016) and serves as a member of IHDP GLOLAL Change Commission, Academia Sinica, Taiwan. His research interests include environmental resources conservation and management in marginal regions. He is a member of international editorial advisory board of Geographiska Annaler, series B. He also published the book "Environmental Struggle in Taiwan" with professor J.F. Williams at Michigan State University in 2008. He was a Professor at National Taiwan University, where he taught at the Department of Geography from 1976 to 2010. He was the President of Geographical Society of Taiwan and the chair of IGU National CommitteeTaiwan from 1999 to 2003. As a volunteer worker, he has also served as the President of the Taipei Yunhe Community University, which supports adult continuing education and social reform since the year 2000.