| Dates | Organization | Position |
| 2002 | Finnish Research Council | Evaluation Committee Ecology and Evolutionary Science |
| 1996 | Norwegian Research Council | Chairman, Peer-Review Committee of Norwegian Aquaculture Research |
| 1994 | Norwegian Research Council | Chairm, Evaluation Committee for Norwegian Marine Research Institute |
| 1992-2000 | Danish and Swedish Goverments | Chairman, International Expert Panel Environmental Effects of Building Oresund Link |
| 1992-1999 | British Natural Environment Research Council (NERC) | Chairman, Land-Ocean Interaction Studies Research Programme |
| 1992-1998 | Danish Strategic Research Programme | Member |
| 1992-1994 | UN/UNEP/Unesco-IOC/FAO/WMO/-WHO/IAEA/IMO | Chairman, Group of Experts on Scientific Aspects of Marine Environmental Protection (GESAMP) |
| 1991-2000 | Young European Environmental Scientist of the Year Competition | Jury Member |
| 1990-Present | Ophelia | Member, Editorial Board |
| 1990-1992 | UN/UNEP/Unesco-IOC/FAO/WMO/-WHO/IAEA/IMO | Vice-Chairman, Group of Experts on Scientific Aspects of Marine Environmental Protection (GESAMP) |
| 1990-1992 | Special Committee on Seal Conservation in Britain | Chairman |
| 1990-1992 | British Natural Environment Research Council (NERC) | Chairman, Marine Sciences Committee |
| 1990 | 2nd World Climate Conference | Co-Chairman, Task Group 3 Oceans, Fisheries and Coastal Zone |
| 1990 | Antarctic Research in Britain, Natural Environment Research Council | Member |
| 1989-1996 | Storebaelt Link | Environmental Consultant |
| 1989 | Environmental Science in Denmark, Danish Council for Research Policy | Member |
| 1988-1998 | UN/UNEP/Unesco-IOC/FAO/WMO/-WHO/IAEA/IMO | Member, Group of Experts on Scientific Aspects of Marine Environmental Protection (GESAMP) |
| 1987-1990 | British Natural Environment Research Council (NERC) | Chairman, Higher Education Affairs Committee |
| 1986-1992 | British Natural Environment Research Council (NERC) | Council Member |
| 1986 | Marine Biology in Britain, Natural Environment Research Council | Member |
| 1985-1997 | Unesco-IOC/IMO/UNEP's | Chairman, Group of Experts on Effects of Pollution (GEEP) |
| 1985 | Aquatic Ecology in Denmark, Danish Science Research Council | Member |
| 1983-Present | Estuarine Coastal and Shelf Science | Member, Editorial Board |
| 1983-1986 | European Marine Biology Symposium | President |
| 1983 | Norwegian Research Council | Deputy Member, Biology Committee |
| 1981-Present | Marine Ecology Progress Series | Member, Editorial Board |
| 1981-Present | Continental Shelf Research | Member, Editorial Board |
| 1981-Present | Marine Pollution Bulletin | Member, Editorial Board |
| 1980-1986 | Swedish Research Council | Member, Biology Committee |
| Arctic Monitoring and Assessment Programme | Member, Expert Panel for Evaluation of AMAP |