Dr. Andrew Derocher is a professor of biology at the University of Alberta in Edmonton, Canada, and a longtime scientific advisor to PBI. He holds a B.S. from the University of British Columbia (1983), a M.S. from the University of Alberta (1987), and a Ph.D. from the University of Alberta (1991). His field research focuses on polar bears in the Canadian Arctic and the polar bears of Hudson Bay. He has also worked with polar bears in Svalbard, Norway, through the Norwegian Polar Institute. Over the course of more than 20 years studying polar bears, Dr. Derocher's research has focused on the limiting and regulating factors of polar bear populations including habitat use, harvest effects, and predator-prey relationships. His current work includes assessment of the effects of climate change and toxic chemicals on polar bears. He is the author of Polar Bears: A Complete Guide to their Biology and Behavior.