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Welcome to my site. I’m a professor in the Department of Geography at the University of Toronto Mississauga. In a nutshell, my research program focuses on northern paleoenvironmental change over recent centuries to millions of years. I specialise in reconstructing the past from natural proxies such as tree-rings, leaf waxes, ice-rich permafrost, and the stable isotopes they contain. Most of this work is based in N.W. Canada and Alaska. Please explore my site for more details.