UN-GESAMP 2007-present; elected Vice-Chairman 2010; elected Chairman September 2013 - ongoing
G7 Workshop on widening the scope of the G7 Action Plan to combat marine litter - invited speaker. October 2016, Bremen.
17th meeting of the United Nations Open-ended Consultative Process on Oceans and the Law of the Sea on Marine debris, plastics and micro-plastics - participation by teleconference, June 2016.
Member of the Advisory Group to the co-hosts (Fiji and Sweden) of a planned UN Conference in 2017 to Support the Implementation of Sustainable Development Goal 14 (SDG14) on the marine environment.
HELCOM Stakeholder Conference on marine litter - invited panelist. March 2016, Helsinki.
17th Annual Large Marine Ecosystem (LME) Consultative Meeting - invited panelist Emerging issues in ocean health. 29 September – 2 October 2015, IOC-UNESCO Paris.
Chair Working Group 40: Sources, fate and effects of microplastics in the marine environment - a global assessment 2012-2014, 2015-2018 (2nd phase)
FAO/IOC FV Fridtjof Nansen programme consultation, 2-4 June 2015, Bergen.
Ocean Acidification International Reference Users Group (OA-iRUG), 2014-2015
GEF Large-Scale Project, Transboundary Assessment - Open Ocean & Large Marine Ecosystem components: pollusion assessment of the Open Ocean, floating litter & POPs in floating resin pellets. 2013-2014
UNEP second Global Land-Ocean Conference (GLOC-2, http://www.gpa.unep.org/index.php/gloc-2), Jamaica, October 2013 – invited keynote speaker and panel member in marine litter session.
UNEP consultation on the Global Partnership on Marine Litter, May 2013 Berlin
PICES Annual Science Conference (North Pacific Science Association), Marine Environmental Quality Committee, co-sponsoring sessions on microplastics (2011) and marine plastics (2014) – 2009 - ongoing
FAO/IOC FV Fridtjof Nansen consultation, September 2012 Paris
International Waters Conference, September 2012 Bangkok
TWAP MSP Steering Committee, February 2012 Nairobi
UNEP Year Book 2011 - Chair of emerging issues - marine debris writing group
5th International Marine Debris Conference, 2011 Honolulu
2nd NOAA International Workshop on micro-plastics, October 2010 Tacoma WA
Co-organiser and co-chair GESAMP/IOC International Workshop on micro-plastic particles as a vector for persistent, bio-accumulating and toxic compounds, June 2010 Paris
Consultant - Study on marine plastic debris and microplastics for the 2nd United Nations Environment Assembly (UNEA-2, May 2016, Nairobi), 2015-2016.
onsultant - Support the UNEP GPA Manila Declaration (2012) in relation marine litter, and the UNEP Programme of Work related to marine litter and the development and implementation of the Global Partnership on Marine Litter (GPML). 2014-2015
Steering Committee - Global Partnership on Marine Litter 2014- ongoing.
Invited technical expert - Review of the Marine Information System (MARIS), Technical meeting, 15-18 September 2014, Monaco.
Invited lecturer on Regional Advanced Training Course on Sampling, Sample Preparation and Analysis for the Measurement of Radionuclides in the Marine Environment, Rovinj, Croatia, 02-12 May 2006
Invited technical expert - Review of the Marine Information System (MARIS), Technical meeting, Monaco, 29 June - 1 July, 2005
Revision of Tec Doc 247 on Sediment distribution coefficients and biological concentration factors for radionuclides. 2000-2002
UK rep. and Chairman of Advisory Group on Sources of Accidental Releases of Radioactivity, and co-writer of report.
Co-ordinated Research Programme: UK rep. (3 years) on radionuclide behaviour in shelf seas.
2nd United Nations Environment Assembly, invited speaker (Norwegian Government) - side event on marine litter at the UNEA-2, May 2016.
Convention on Biological Diversity, marine debris workshop - invited presentation (teleconference), December 2014.
International Whaling Commission, Preparatory Workshop on ‘Assessing the impacts of marine debris on cetaceans’, Woods Hole MA, USA, May 2013
ICES: The Regional Ecosystem Study Group for the North Sea (REGNS), 2003-2006
ICES Marine Sediments Working Group, working on a definition of contaminated sediments and methodology. 2005-2008
ICRU/EC/GSF International Workshop on: Measuring Radionuclides in the Environment - Radiological Quantities and Sampling Designs, 1997. Invited expert. (Proc. ed. Voigt, G., 1998, GSF-Bericht 22/98).
ICSU-SCOPE RADPATH Group: invited co-ordinator of aquatic pathways sub-group 1988-1991, Radioecology after Chernobyl, Biochemical Pathways of Artificial Radionuclides.
G7 Lead UK representative at technical meeting dealing with radioactive waste dumping in the Arctic by USSR/Russia.
OECD-NEA: Nuclear Energy Agency, Co-ordinated Research and Environmental Surveillance Programme (CRESP): UK rep. (12 years) on the Geochemistry and Physical Oceanography Task Group, a multi-national group dealing with the low-level radioactive waste site in the NE Atlantic.
EU DG Environment Framework Agreement on emerging issues, including aquaculture, marine litter, non-indigenous species and marin elitter. 2012-2016.
EU-FP7 Science in Society, Mobilisation & Mutual Learning Action Plan: Marine litter in Europe Seas: social awareness and co-responsibility (MARLISCO) project - 2012 - 2015
EU-FP7 Knowledge-based sustainable managment of Europe's Seas (Knowseas), Work Package leader, 2009-2013
EU-FP6 European Lifestyles and Marine Ecosystems (ELME). Work Package Leader, 2004-2006
EU-FP6 Integrating new technologies for the study of benthic ecosystem response to human activity: towards a Coastal Ocean Benthic Observatory (COBO). Work package leader, 2003-2006
EU-FP5 Euratom programme: Processes regulating remobilisation, bioavailability and translocation of radionuclides in marine sediments (REMOTRANS) Work package leader.
EURATOM Studies on the transport of coastal water from the English Channel to the Baltic Sea using radioactive tracers, a 3-year collaborative project with institutes in France, Netherlands, Germany and Denmark, 1990-1993.
EU-Radiation Protection Research Programme: collaborative project on long-lived radionuclides, 1980-1990.