Heejun Chang Expert in Climate Change and Water Geography Office Phone 503-725-3162 Email changh@pdx.edu Professor, Geography Dr. Heejun Chang's work examines the combined impacts of climate change and urban development on water supply, water quality, water demand, and water ecosystem services. Education Ph.D., Geography, Pennsylvania State University, 2001 M.A., Geography, Seoul National University, 1996 B.A., Geography, Seoul National University, 1994