United Nations
- Chair of the UNECE ICP Forests (since 2005)
- Contribution Author IPCC
- Report „Good Practice Guidance for Greenhouse Gas Inventories and Uncertainty Management in Land Use, Land-use Change and Forestry“ (2001 - 2004)
- United Nations FAO/ ECE Timber Division, Geneva, Leader "Team of Specialists on Temperate and Boreal Forest Resource Assessment 2000 (TBFRA-2000)" (1994 - 2004)
- UNECE ICP Forests, Member Specialist Working Group on Increment Analysis in Permanent Sample Plots, Contribution to "Manual on Monitoring Air Pollution Effects in Forests" (1993 - 1995)
- United Nations FAO/ ECE Collaboration „Expert Consultation on Global Forest Resources Assessment 2000“ (1995 - 1996)
Ministerial Conference on the Protection of Forests in Europe (MCPFE)
- Co-editor of the report “State of Forests and Sustainable Forest Management in Europe 2007” for the 5th MCPFE, Warsaw 2007
- Coordinator Advisory Group on the Improvement of the Pan-European Indicators for Sustainable Forest Management, MCPFE (2001 - 2003)
International Union of Forest Research Organizations (IUFRO)
- Deputy leader IUFRO –> Subject Group S.4.02 "Forest Resources Inventory and Monitoring"
(since 2005)
- Leader IUFRO –> Subject Group S.4.02
"Forest Resources Inventory and Monitoring"
(2001 - 2005)
- Leader IUFRO –> Subject Group S.4.11
"Statistics, Mathematics and Computers" (1995-2000)
- Leader IUFRO – Working Group S.4.11.1
"Statistical Methods" (1990-1995)
European Forest Institute (EFI)
- Member EFI Board (since 2010)
- Member Scientific Advisory Board (2006 - 2010)
- Associate Research Expert (since 1996)
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