| 2015 - 2019 | Work package leader, SCCER Biosweet. |
| 2011 - 2019 | Research group leader ‘Forest Production Systems’, Swiss Federal Research Institute WSL, Switzerland. |
| 2009 - 2011 | Research unit leader ‘Forest Production Systems’, Swiss Federal Research Institute WSL, Switzerland.
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| 2003 - 2007 | Department head ‘Management of Forest Use’, Swiss Federal Research Institute WSL, Switzerland.
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| 2000 - 2009 | Research program leader ‘Management of Forest Use’, Swiss Federal Research Institute WSL, Switzerland. |
| 1989 - 1999 | Research group leader ‘Forest Technology’, Swiss Federal Research Institute WSL, Switzerland. |
| 1988 | Research associate of the research group ‘Forest Management’, Swiss Federal Research Institute WSL, Switzerland. |
| 1987 | Consultant, Rigesa, Cellulose, Papel e Embalagens LTDA, Brasil. |
| 1985 - 1986 | Trainee Forester, Administration of State Forest, Rhineland-Palatinate, Germany. |
| 1980 - 1984 | Scientific assistant, Faculty of Forestry, Freiburg University, Germany. |