Mark J. Spalding
- Blue Legacy International (Board of Directors member, 2014-2015)
- The Collaborative Institute for Oceans, Climate and Security, University of Massachusetts Boston (Advisory Board member)
- Eco-Alianza Loreto A.C. (Advisory Board member)
- Island Press (Thought Leaders Council member)
- Just Travel (Advisory Council member)
- SuMar A.C. (Advisory Board member)
- Sustainability Accounting Standards Board advisor on resort and cruise ship sustainability accounting (2014)
- Western Hemisphere Migratory Species Initiative (Advisory Council member)
- American Field Service (founder and past president of San Francisco chapter)
- British School of Motor Racing (graduate)
- Citizens Steering Committee for the Tijuana Parallel Wastewater Conveyance System Improvements Project (Chair, 1997)
- Environment Committee of the San Diego-Tijuana Region (member, 1994 – 2004)
- InfoMexus Border Information Institute (Advisory Board member)
- Interfaith Task Force/Centro de Asuntos Migratorios (volunteer attorney, 1990-1992)
- Institute of the Americas (consultant and member, 1994 – 2003)
- International Bering Sea Forum (member)
- North American Committee for Responsible Hazardous Waste Management (member, 1994 – 2004)
- One Earth, One Justice (Board of Directors member)
- Pro Peninsula (Board of Directors Member, Chair 2001 – 2005)
- Project Concern International (consultant, fund-raiser and volunteer, 1994 – 2003)
- San Diego-Tijuana Border Initiative (Co-Chair Environment Committee)
- Southwest Consortium for Environmental Research and Policy (Advisory Board member, 1998 – 2001)
- Surfrider Foundation (Board of Directors member 2000-2006 and 2014-2016, Chair 2001, and Treasurer, 2014-2015)
- Terra Peninsular (Board of Directors member, 2000 – 2003)
- Travel Just (Advisory Council member)
- United Nations Association (Board of Directors member, 1994 – 1995, and Coordinator of events for the celebration of the 50th Anniversary of the UN)
- U.S.-Mexican Border Environmental Information Web (Advisory Board member, 1994 – 2004)