I am a vegetation ecologist. I have analysed variation in species composition in Norwegian ecosystems (mire, boreal forest, agricultural landscapes and alpine heaths) in relation to the environment. I take particular interest in statistical methods for analysis of vegetation-environment relationships, among others ordination and distribution modelling methods, plant population biology, ecosystem monitoring, and systems for description of variation in nature. From 2005 I am responsible for development of the type and description system for variation in Norwegian nature, 'Natur i Norge'.
Cand. scient. Botanical Garden and Museum, University of Oslo 1980, dr. philos. same place 1991.
Employments: Assistant professor, Botanical Garden and Museum, University of Oslo 1980-84, Research fellow Økoforsk (later NINA), Ås 1984-86; associate professor Botanical Garden and Museum (from 1999 Natural History Museum), University of Oslo 1986-present (professor from 1993). Head of Botany Department 2001-09; Head of Geo-ecological Research Group (of the Department of Research and Collections) 2013-present.
Most of my activities have a relationship with the 'Natur i Norge' (NiN) project