| (*) Since 2024 | Co-Chair of the "Development Program Strategic Working Group" (DPSWG) of the Planning and Development Authority of the Government of Grenada.
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| (*) Since 2023 | Co-chair, Program Committee of the workshop “Cybersyn 3.0: Cybernetics for the Socio-Ecological System” to be held in Winter 2024. |
| (*) Since 2022 | Member of the "Development Program Strategic Working Group" (DPSWG) of the Planning and Development Authority of the Government of Grenada tasked with developing a strategy for the physical development of the small island state.
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| (*) Since 2021 | Lead of the Earth Viability Center team developing Place4Us,https://www.place4us.net, a social collaboration platform for science and evidence-based communities and informal learning |
| (*) Since 2020 | Co-Founder and Co-Chair, Earth Viability Center; see http://www.earthviability.org |
| 2024 | Co-organizer of the workshop "Hampton Roads Climate Change and Environmental Justice Challenges Part 1", Norfolk, VA, US, April 22, 2024, see http://www.maricol.org/place4us/HamptonRoads/Workshops |
| 2022 | Co-organizer of the workshop "Marine Litter: Solutions for a Cleaner Ocean", Brest, France, September 28-29, 2022, see https://www.gstss.org/2022_Brest/ |
| 2021 | Co-organizer of "One Integrated Marine Debris Observing System for a Clean Ocean"; Satellite Activity of the UN Ocean Decade: Clean Ocean Laboratory Satellite Event, see https://www.eu4oceanobs.eu/ocean-decade-lab-satellite-activity/ |
| 2021 - 2023 | Lead Guest Editor for the special issue "The Coastal Zone in the Anthropocene: Understanding and Reducing the Risks for the Ocean" to be published in 2022 in the Journal for Marine Science and Engineering, |
| 2019-2021 | Co-Chair, Program Committee for the workshop on "Linking Data to Actions on Marine Debris for the Ocean Decade," Lisbon, Portugal, May 29-30, 2020 (postponed to Sep. 2022 due to COVID-19). |
| Since 2019 | Co-Lead of the IEEE OES Initiative on Plastics in the Oceans; see https://www.gstss.org/plastic. |
| 2019 - 2020 | Co-Chair, Program Committee for the workshop on "Marine Debris Indicators: What’s Next? Brest, France, December 16-18, 2019. |
| 2018-2019 | Co-Chair, Program Committee for the workshop on "Technologies for Observing and Monitoring Plastics in the Oceans", Brest, France, November 26-27, 2018. |
| (*) Since 2019 | Member, GEO Blue Planet Working Group on Marine Debris. |
| (*) Since 2019 | Member, Board of Directors, Earthzine. |
| 2017 - 2021 | Co-Chair of the IEEE/Oceanic Engineering Society Technical Committee on Earth Observations. |
| (*) Since 2017 | Member of the IEEE/Oceanic Engineering Society Technical Committee on Ocean
Observation Systems and Environment Sustainability. |
| (*) Since 2017 | Member, Board of iCREST, Educational Outreach for Earth Resiliency Literacy of the International Center for Earth Simulations (ICES). |
| 2017-2018 | Chair, Program Committee of the GEO Workshop on "Implementation and Monitoring of Sustainable Development Goals in the Caribbean: The Role of the Ocean" held on January 2018 on Saint Vincent and the Grenadines. |
| 2016 | Chair, Program Committee of the 5th GEOSS Science and Technology Stakeholder Workshop "Linking the Sustainable Development Goals to Earth Observation, Models and Capacity Building" held in Berkeley, CA, USA in December 2016. |
| 2016 | Member, Program Committee of the ConnectinGEO Workshop on ENEON, Laxenburg, Austria, October 13-14, 2016. |
| 2016 | Member, Program Committee of the ConnectinGEO Workshop on Gap Analysis, Laxenburg, Austria, October 11-13, 2016. |
| 2015 | Member, GEO Ministerial Summit Working Group. |
| 2015 | Member, Program Committee of the ConnectinGEO Workshop on ENEON, Paris, France, September 22-13, 2015. |
| 2015 | Member, GEO Working Group on Ministerial Summit. |
| 2015 | Member, Program Committee ConnectinGEO Workshop on Essential Variables, Bari, Italy, June 11-12, 2015. |
| (*) Since 2015 | Member, Steering Committee of the GEO Blue Planet Initiative. |
| (*) Since 2014 | ODU Representative to UNAVCO and WINSAR. |
| 2014-2018 | Co-Chair, IEEE/OES Technical Committee on Earth Observations. |
| 2014 - 2020 | Co-Chair of the Coastal Vulnerability Initiative of the Community Surface Dynamics Modeling System. |
| 2014 | Co-Convener of the Session on Extreme Geohazards and Global Disasters at the International Disaster and Risk Conference 2014, August 2014, Davos, Switzerland. |
| 2012 - 2015 | Co-Chair, Program Committee of the 3rd GEOSS Science and Technology Stakeholder Workshop "Navigating Sustainability on a Changing Planet" and the 4th Workshop "Concepts, Technologies, Systems and Users of the next GEOSS." |
| 2012 - 2015 | Lead Author of the community white paper "Extreme Geohazards: Reducing the Disaster Risk and Increasing Resilience" supported by the European Science Foundation. |
| 2011 - 2012 | Co-Chair, Program Committee of the 2nd GEOSS Science and Technology Stakeholder Network Workshop "GEOSS: Supporting Science for the Millennium Development Goals and Beyond", Bonn, Germany, August 2012. |
| 2011 - 2013 | Co-chair, Program Committee for the Fifth IGCP 565 Project Workshop on "Improving regional water management in Africa and Asia on the basis of geodetic water cycle monitoring", October 2012, Johannesburg, South Africa. |
| 2011 | Co-Convener of the Session "Characterizing Major Disasters Caused by Geohazards," AGU Fall Meeting, December 2011, San Francisco. |
| 2010 - 2012 | Co-chair, Program Committee for the Fourth IGCP 565 Project Workshop on "Integration of geodetic observations and products in models of the hydrological cycle - Support for water management through hydrological models and data assimilation", November 22-23, 2011, Johannesburg, South Africa. |
| 2011 - 2012 | Co-Chair, European Science Foundation Workshop "Understanding Extreme Geohazards: The Science of the Disaster Risk Management Cycle", November 28-December 1, 2011, Sant Feliu de Guixous, Spain. |
| 2011 - 2019 | IEEE Representative to the GEO Work Plan Task ID-03 "Science and Technology in GEO." Task Coordinator and Task Component 1 Point of Contact |
| 2011 - 2019 | IEEE/ID03 Representative to the Institutional and Development Implementation Board of GEO |
| 2011 - 2019 | IEEE/GHCP Representative to the Societal Benefits Implementation Board of GEO |
| 2010-2011 | Co-Chair, Program Committee of the Workshop "Building a User-Driven GEOSS: Methods to Capture, Analyze, and Prioritize User Needs, April 10, 2011, Sydney, Australia. |
| 2010 - 2011 | Member, GEO Task Force on Gap Analysis. |
| 2010-2011 | Co-Chair, Program Committee of the 1st GEOSS Science and Technology Stakeholder Workshop "Connecting GEOSS and its Stakeholders in Science and Technology", Bonn, Germany, May 9-11, 2011. |
| 2010-2011 | Member, Program Committee for the Workshop "Earth Observation Support for Sustainable Tourism in Small Island States", March, 9-11, 2011, San Juan, Puerto Rico. |
| 2010-2011 | Co-chair, Program Committee for the third IGCP 565 Project Workshop on "Separating Hydrological and Tectonic Signals in Geodetic Observations", October 11-13, 2010, Reno, Nevada, USA. |
| 2010 | Member, Organizing Committee for the US-Africa Workshop on "Expanding the AfricaArray Network to Support Multidisciplinary Science in Africa", June 2-4, 2010, Washington, D.C., USA. |
| 2010 | Member, Program Committee for the Workshop "Decision-Making Support For Coastal Zone Management, Water Resources & Climate Change In Africa", February, 15-18, 2010, Cotonou, Benin. |
| 2010 | Co-chair of the Program Committee for the Workshop "Building a Geohazards Community of Practice in Support of GEO Work Plan Tasks and GEOSS Implementation," January 18-22, 2010, Paris, France. |
| 2010-2011 | IEEE Representative to the GEO Science and Technology Committee |
| 2010-2011 | IEEE Representative to the GEO User Interface Committee |
| (*) Since 2010 | Co-Chair, GEOSS Science and Technology Stakeholder Network. |
| 2009 | Co-Convener of four sessions, AGU Fall Meeting, December 2008, San Francisco ("Severe Storms and Sea level Rise: A Challenge for Science and Society," "Extreme Natural Hazards: Risk Assessments, Forecasting, and Decision Support," "The Global Geodetic Observing System: Scientific Requirements and Applications," "Science and Technology in GEO and GEOSS"). |
| 2009 | Co-chair of the Program Committee, Second Annual Workshop of the IGCP 565 Project "Towards a Roadmap for Future Satellite Gravity Missions", September 30 - October 2, 2009, Graz, Austria |
| 2009 | Co-Convener, "Earth observation and the Global Geodetic Observing System (GGOS)", Session at the IAG Symposium "The Global Geodetic Observing System: Science and Applications", August 31-September 4, 2009, Buenos Aires, Argentina. |
| 2009 | Co-Convener, "The Global Geodetic Observing System: Ground and Space-based Infrastructure for Earth Science", Session G8, EGU General Assembly, April 2009, Vienna, Austria |
| (*) Since 2009 | Co-Chair, Geohazards Community of Practice of the Group on Earth Observations (GEO). |
| 2009 - 2011 | Point of Contact and Task Lead for the GEO Task ST-09-02 "Promoting Awareness and Benefits of GEO in the Science and Technology Community" |
| 2008 | Co-Convener, "Global Geodetic Observing System: Science and Instrumentation", Sessions G31C and G33A, AGU Fall Meeting, December 2008, San Francisco. |
| 2008 - 2019 | Member of the GGOS ad hoc Working Group on an ITRS ISO Standard |
| 2008 | Chair of the Program Committee, First Annual Workshop of the IGCP 565 Project "Science of geodetic monitoring of the hydrological cycle", December 2008, San Francisco, USA |
| 2008 | Co-Convener, "Earth observation and the Global Geodetic Observing System (GGOS)", Session at the IAG Symposium "Gravity, Geoid and Earth Observation GGEO 2008", June 23-27, 2008, Chania, Crete, Greece. |
| 2008 | Co-Chair of the Program Committee of the first GEO Workshop of the Coastal Zone Community of Practice: "GEOSS Support for Decision-Making in the Coastal Zone: Managing and Mitigating the Impacts of Human Activities and Natural Hazards in the Coastal Zone", June 2008, Athens, Greece |
| (*) Since 2008 | Co-Chair of the GEO Coastal Zone Community of Practice (CZCP) |
| 2008 | Panel member, "Climate Change and Transportation Panel", Water Canada, May 14, 2008.
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| 2008 | Co-Convener, "GGOS: Observing and Interpreting Earth's Mass Transports", Session G12, EGU General Assembly, April 2008, Vienna, Austria |
| 2008 | Member of the Science Advisory Group for the Delta Commission of the Dutch Parliament on future sea level changes |
| 2008-2012 | Lead Project Leader of the IGCP 565 Project "Developing the Global Geodetic Observing System into a Monitoring System for the Global Water Cycle" |
| 2007-2010 | GGOS Representative to the GEO Science and Technology Committee |
| 2007 | Organization of the GEO/GGOS Workshop 2007, November 2007, Frascati, Italy |
| 2007-2013 | Member of IAG's Inter-Commission Working Group 2 "Concepts and Terminology related to Geodetic Reference Systems" |
| 2007-2010 | Chair of the GGOS Working Group on GEO Relations |
| 2007 | IAG/GGOS Representative in the GEO Task Force 2 for the preparation of the Ministerial Summit on Earth Observation |
| Since 2007 | Member of the GEO "Coastal Zone" Community of Practice |
| 2006 | Organization of the GGOS Workshop 2006, October 2006, Munich, Germany |
| 2006-2010 | GGOS Representative to the GEO Architecture and Data Committee |
| 2007-2012 | Point of Contact and Task Lead for the GEO Task DA-09-02c (former AR-07-03) "Global Geodetic Reference Frames" |
| 2006-2009 | Coordinator and Lead Editor of the GGOS 2020 Strategy Process: "The Global Geodetic Observing System: Meeting the Requirements of a Global Society on a Changing Planet in 2020" |
| 2005-2008 | GGOS Representative to the Joint GARS and IGOS-P Steering Committee for the Geohazards Theme |
| 2005-2010 | GGOS Representative to the GEO User Interface Committee |
| 2005-2010 | Vice-chair of the Steering Committee of the Global Geodetic Observing System (GGOS) and member of the Executive Committee |
| 2005-2007 | IAG delegate to the GEO Working Group on Tsunami activities |
| 2005-2006 | Principle Investigator, "Appraisal of relative sea level rise scenarios for Venice" |
| 2004-2005 | Principle Investigator, "National geodetic infrastructure - current status and future requirements" |
| 2004-2009 | Member of the IAG Delegation to the annual GEO Plenary and Ministerial Summits on Earth Observations, Deputy head of delegation |
| 2004-2012 | Member of the Advicory Committee for the IERS Conventions |
| 2004-2006 | External Expert member of the Project Team, European Sea Level Service Research Infrastructure (ESEAS-RI) |
| 2004-2005 | IAG delegate to the GEO Working Group "User requirements" |
| 2004-2006 | Chair of the GGOS working group "Copyrights, Data Access Policy, Publishing, and Certification" |
| Since 2002 | Associate Member of the International Earth Rotation Service |
| 2002-2004 | Principle investigator, "Determination of geodetic coordinates of the EGNOS RIMS and NLES sites" |
| 2002-2004 | Coordinator, Norwegian Research Project OCTAS "Ocean Circulation and Transport between North Atlantic and Arctic Sea" |
| 2002-2004 | Coordinator, EU-Project "ESEAS-Research Infrastructure" |
| 2002-2004 | Principle investigator, Galileo System Test Bed V1 Stand-alone Test Case
"Geodetic Galileo" |
| 2002 - 2015 | Co-chair, Special Bureau for Loading of the Global Geophysical Fluid Center of the IERS, 2004 - 2015 chair |
| 2001-2004 | Director, Central Bureau of the European Sea Level Service (ESEAS) |
| 2000-2004 | National Delegate, IAG Commission V and XIV. |
| 2000-2016 | Associated Member of the International VLBI Service |
| 2000 | Organisation of the IGS Network Workshop and the COST 716 Workshop "Towards operational GPS-Meteorology" in Oslo, Norwegen |
| 2000-2006 | Secretary of the EGS subsection II.B2: "Global and Regional Interdisciplinary Networks" |
| 1999-2004 | National Delegate & Co-chair 2001-2004, COST Action 716: "Exploitation of ground-based GPS for climate and numerical weather prediction applications" |
| 1998-2015 | Associated member of the International GPS Service |
| 1998 | Organisation of the WEGENER 98 meeting in Norway |
| 1998-2002 | Chair of the COST Action 40 "European Sea Level Observing System (EOSS)", including the organization of biannual meetings and two international workshops. |
| 1997-2004 | Member of the Ny-Alesund Science Manager Committee (NySMAC) |
| 1997-2002 | Responsible Scientist in the EU TMR Project "VLBI-Europe" and the EU-funded Large Scale Facility Ny-Alesund |
| Since 1996 | Editor-in-Chief (for Geodesy) of Physics and Chemistry of the Earth |
| 1996-2000 | Secretary of the EGS subsection II.5: "Geodetic aspects of global change phenomena" |
| Since 1994 | Member of the Editorial Board of the Journal of Geodynamics |
| Since 1992 | Several times convener at annual meetings of the EGS/EGU, the German Geophysical Society, AGU, as well as IUGG assemblies |
| 1995-1999 | Chairperson of the Science Panel of the WEGENER Board |
| 1995-1999 | Contractor of the EU project SELF II |
| 1993-1994 | Subcontractor of the EU project SELF |
| 1989-1999 | Member of the WEGENER-Consortium and participation in the DOSE-Programme of NASA |
| 1989-1997 | Participation in the German national Earth rotation research programme |
| 1988-1995 | Participation in the LAGEOS-II-Programme of NASA and ASI |
