Associate professor emeritus
Taxonomy and biogeography of arctic and antarctic lichens with focus on the family Teloschistaceae; methods include secondary metabolites and DNA-sequencing. Lichens as biomonitors of air pollution, particularly nitrogen deposition originating from agriculture. Lichens on nitrogen enriched heathland.
Secretary of the Nordic Lichen Society (NLF).
Treasurer of the International Association for Lichnology (IAL).