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David R. Clements, PHD, is Associate Professor of Biology and Environmental Studies at trinity Western university in Langley,. British Columbia. Dr. Clements completed his PhD in Kingston, Ontario, Integrated pest management in apple orchards. During his post-doctorate research at the university of Guelph, he continued to apply ecological principles to pest management, working in the area of weed management of row crops. He has taught ecology and botany courses at Trinity Western University since 1994, including field courses in plant ecology in the Gulf Islands off the coast of British Columbia and in the Hawaiian islands. He continues to research various aspects of integrated weed management in agriculture as well as study invasive weed biology in natural ecosystems. Dr. Clements has published accounts for seven species in the Biology of Canadian Weed series of the Canadian Journal of Plant Science (CJPS) and was also recently named an Associate Editor of the CJPS, with responsibility for the Biology of Canadian Weed series. He has published more than 25 refereed articles. Dr. Clements is a member of several organizations, including the Canadian, the Soil and Water Conservation Society, and the Langley Environment Partners Society.