Doctor of Philosophy, Swedish University Agricultural Sciences, Uppsala, 1971.
Coordinator soil process group Swedish Coniferous Forest Project, 1973-1974, coordinator clear cutting experiment group, 1975-1981. Associate professor Swedish University Agricultural Sciences, 1973, project leader dinitrogen fixation and soil nitrogen transformations, since 1978, senior lecturer, since 1969. Project leader research on dinitrogen fixation in rice paddy fields and fuel-wood production Swedish Agency and Research College with Developing Countries, Sri Lanka, 1977-1981, 85-91.
Referee to science journal. Oikos, Lund, 1971-1977. Science advisor Swedish International Development Agency, Austria, Burkina Faso, China, Niger, and The Philippines, 1984-1992.
Advisor International Foundation for Science, Stockholm, since 1980. Reviewer United States Department of Agriculture National Research Initiative, Competitive Grants Program, since 2000.
Member Swedish Soil Science Society, Uppland-Vaestmanland Cross Country Club (chairman 1980-1981), Bjoerklinge Riding Club (chairman 1989-1993, 95-2001).
Married Birgitta Elisabet Larsson, 1976 (divorced 1982). Children: Charlotte, Caroline. Married Eva Marianne Silfver, December 29, 1989 (divorced 1997).
Children: Carl-Henrik, Hannes.