Mark Cliffe-Phillips is the Executive Director of the Mackenzie Valley Environmental Impact Review Board (Review Board), which is an independent co-management tribunal responsible for the environmental impact assessment process in the Mackenzie Valley of the NWT. The Review Board is the result of modern comprehensive land claims that created a co-management resource management system that enabled Indigenous peoples of the NWT to have greater say in the decision making process. 

Prior to joining the Review Board, Mark was the Executive Director of the Wek’èezhìı Land and Water Board, which was responsible for the licensing and permitting of Canada’s largest diamond mines. Mark has been working in the resource co-management sector in the Northwest Territories for over 20 years. He was also a founding Board member of the Indigenous Centre for Cumulative Effects, where he is now a member of the Technical Advisory Committee. He frequently participates in various environmental assessment improvement and cumulative effects initiatives across the North and the rest of Canada.