Duncan has a Masters degree in Tropical Coastal Management and a BSc in Geography and has spent 15 years working around the globe in coastal management. He is also a Fellow of The Royal Geographical Society and a member of the IUCN World Commission on Protected Areas. Since graduating his work has included research, practical management and policy development in Madagascar, Southern Thailand, Vietnam, Indonesia and the Middle East relating to protected areas and sustainable development.
Duncan assisted the marine park manager for the Bonaire National Marine Park in 2001/2002, working on Environmental Impact Assessment, wastewater management and research into the effects of diving tourism on coastal ecology. Since January 2005 Duncan has been working extensively with the Dutch Caribbean Nature Alliance (DCNA) to develop a tool to demonstrate the successes of the ten protected areas within the Dutch Caribbean. In conjunction with this he has written Management Plans for a number of the protected areas of the Dutch Caribbean. As part of the Management Success and Management Planning projects Duncan continues to work with DCNA to define and implement innovative processes for adaptive conservation management.