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Nigel Dudley established Equilibrium in partnership with Sue Stolton in 1991. Equilibrium's work has included production of books, technical reports and research papers, environmental impact assessments, investigative research, field research and projects; memoranda to governmental and inter-governmental bodies, proofs of evidence to public inquiries, producing and editing newsletters and journals; running web sites and organisation of conferences and workshops. Our work has encompassed over fifty countries, and Equilibrium has been involved in field projects in Tanzania, Uganda, Cameroon, Gabon, South Africa, Indonesia, Vietnam, India, China, Costa Rica, Uruguay, Russia (Far East and Siberia) and Wales. Equilibrium's clients have included:
  • Non governmental organisations, both national and international, including WWF the World Wide Fund for Nature, IUCN The World Conservation Union, The Nature Conservancy, Friends of the Earth, Greenpeace, the International Federation of Organic Agricultural Movements, the Pesticides Trust, the Soil Association, the Consumers Association and many others.  
  • Academic Institutions, including the Ecole Polytechnique Fédérale de Lausanne, Switzerland, the Open University, UK, University of Wales and the University of Queensland, Australia.  
  • International bodies, including the World Bank, the Convention on Biological Diversity, United Nations Economic Commission for Europe, United Nations Commission on Sustainable Development, United Nations Environment Programme and UNESCO.  
  • National and local government, such as the German aid ministry BMZ and technical co-operation organisation GTZ, the UK Department of the Environment, former Nature Conservancy Council, Countryside Commission of England and Wales, UK Forestry Commission, Norwich City Council, Grampian Enterprise and the South East Economic Development Strategy.  
  • Business, including Touche Ross, Enso Forest Development Oy and individual clients such as the late Sir James Goldsmith.  
  • Publishers and journals, including writing around twenty books for a variety of publishers, journal articles, work with Encilopèdia Catalana and acting as an environment consultant to Hutchinsons Encyclopaedia series for several years. 
Nigel is a senior conservation advisor to WWF International and an associate of Elm Farm Research Centre. Sue and Nigel are both members of the IUCN World Commission on Protected Areas (WCPA) and the IUCN Commission on Environmental, Economic and Social Policy (CEESP). Nigel is currenty chairing a task force for WCPA on the IUCN protected area management categories, looking to revise guidance to their use.

Nigel Dudley graduated with a joint honours degree in zoology and botany from the University College of Wales, Aberystwyth in 1976, after which he worked for the Nature Conservancy Council and spent four years at the Centre for Alternative Technology, a renewable energy research centre in Wales. Since 1981, he has worked as a consultant and writer, increasingly concentrating on environmental policy research and, latterly, on issues relating to forest quality, protected areas and landscape approaches to conservation. From 1983-1992, Nigel Dudley was a consultant with Earth Resources Research, an environmental research group and charity based in London. During the 1980s, he was also closely connected with The Soil Association, Britain''s leading organic farming organisation, both as a council member and later by holding a number of positions with the organisation, including that of Executive Director. In 1991, he set up Equilibrium with Sue Stolton.

Sue Stolton worked for development and environmental charities in the 1980s and became freelance in 1991. Her experience covers research, writing and editing. Her current main areas of research interest include protected areas and organic agriculture. Sue graduated from the University of East Anglia in 1983 with an honours degree in English Social and Political History. In the mid-1980s, she worked in London for Action Aid, a ''third world'' child sponsorship charity, on its Burundi Programme. She then spent four years at the Soil Association in Bristol, a charity promoting the economic and environmental benefits of organic agriculture and campaigning on a wide range of issues relating to food and the environment. Since the mid-1990s much of her work has centred around the management effectiveness of protected areas and developing the 'arguments for protection' project with WWF and partners..