Dr. Colin Macdonald has over three decades of research experience in environmental toxicology, much of it in northern Canada. His first northern experience was on north Baffin Island, where he studied the accumulation of the metals in the diets of ringed seals. This led to a project studying pesticides and other contaminants in lakes in Ontario at Trent University and the effects of man-made chemicals in wildlife at the National Wildlife Research Center in Gatineau, Québec and at Whiteshell Laboratories in Pinawa, MB. His research included projects on historic radiation like cesium-137 and other contaminants in barren-ground caribou, fish and other wildlife species. He has been an independent consultant since 1998 and worked on the assessment of contamination in plants, animals, fish and vegetation at Port Radium, Sawmill Bay, Silver Bear Mines, Contact Lake and other abandoned mine sites to the east of Great Bear Lake. He provides advice to the Sahtú Renewable Resources Board on issues related to the permitting of projects, reviews project reports, and advises on technical issues relating to renewable resources and environmental quality in the Sahtú. He lives in Pinawa, Manitoba.