Chairman Think Tank for International Forestry Issues, Stockholm (2010 to date)
Chairman Committee on International Forest Issues of the Royal Swedish Academy of Agriculture and Forestry (KSLA) (2001 to 2013)
Founder Member and Member Governing Council of the African Forest Forum (2007 to date)
Chairman of the Steering Committee on project Lessons Learnt on Sustainable Forest Management in Africa (2003–2005)
Director, International Foundation for Science (IFS), Stockholm (1992–2000); Director General, the International Centre for Research in Agroforestry (ICRAF) Nairobi (1981–1991)
Chairman of the Board of the United Nations University Institute for Natural Resources in Africa (UNU/INRA), Accra, Ghana (1996–2002)
Member of Boards of Trustees of CATIE, Costa Rica (2002–2007) and the African Forest Research Network (AFORNET), Kenya (2000-2010)
Several consultancy and project/institution evaluation tasks in Asia (Laos, India, Sri Lanka, Bangladesh), Central America and the Caribbean (Jamaica, Dominican Republic, Costa Rica) and Africa (15 different countries).
M.Sc. Forestry 1969, Ph.D. Forest Ecology and Soils 1978.