W. Andrew Marcus, Ph.D., is a Professor of Geography at the University of Oregon, where he has served in key leadership roles including two years as the Tykeson Dean of Arts and Sciences and three years as interim dean. Dr. Marcus studies human impacts on the hydrology, geomorphology and flora and fauna of rivers, with an emphasis on methods for documenting and modeling those impacts. Much of his work occurs in the Yellowstone ecosystem and other mountain environments. In 2012, he was the lead editor of the award-winning Atlas of Yellowstone. In his academic career, which spans the University of Oregon, Montana State University and the University of Maryland, Dr. Marcus has supervised or served on committees for more than 30 Ph.D. dissertations and 30 master's theses as well as published nearly 100 scientific papers, conference proceedings and book chapters. In addition to his geographic research, Dr. Marcus was a founding board member and chairman of the board of the Central Asia Institute, which provides schools and schooling for girls in northern Pakistan and Afghanistan. With decades of experience advising residential environmental education programs, he has served on NatureBridge's Education Advisory Council since 2009. Prior to that, he was a trustee on Yosemite National Institute's board of directors for more than a decade and on Olympic Park Institute's board for six years.