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David Cook's connection to sustainable development began with the development of The Natural Step (TNS) in the UK. His previous career involved various senior management appointments in the public sector, including work with schools, social services and the probation service. David was Chief Executive of an award-winning public/private Project Company, to plan, fund and deliver a new University in the UK. David has always had particular interest in the human behavioural aspects of organisational change, and in overcoming barriers to creativity and development.