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Introduction
I am Professor of Chemical Engineering (1994), heading the Biogeochemistry and Systems Analysis Group since 1983. I am a native Norwegian (1954), enjoying the creativity of the Swedish academic environment since 1980.

My research
My research is strongly influenced by the supervision of many PhD students in many fields, from many different viewpoints and by colleagues with different backgrunds.
I conduct research actively into chemical weathering of minerals in soils, soil chemistry modellig, forest ecosystem modellig, aquatic ecosystem modellig involving population dynamics and the P and Hg cycles. My research has so far focused on how to model soil processes and their inteaction with trees in a mechanistic way. Our work has come to wide use in the work under the UN/ECE-LRTAP convention where we have built and adapter models like PROFILE, SAFE, FORSAFE, AGRO-SAFE and BigMERK to regional use in Europe. Much effort has gone into developing the concept of "Critical loads" and to implement it throughout different regions of the world.

I conduct research into chemical weathering kinetics and the mechanistic modelling of this process using the transition state theory. The PROFILE model is a result of this research, a model that can a-priori predict weathering rates based on first principles and fundamental data, without requiring any calibration.

In our work we have many contacts with European and American research institutions. I also do research on developing mathematical models for language dispersal in the past and how this is connected to the dispersal of man on earth, reskulting in genetical and linguistic patterns. The process has been modelled with the anthropologically focused LANGUAGE model. Our research is largely externally funder by Swedish Governemental Boards, Research foundations (MISTRA) and EU. Swedish industry also fund some development project.