Professor William Tad Pfeffer is a glaciologist and geophysicist for the Department of Civil, Environmental, and Architectural Engineering here at the University of Colorado at Boulder. His research is focused on glacier mechanics and dynamics, which has led him to glacier regions across the world from Alaska to Antarctica to the summit of Mt. Kilimanjaro. In addition to being a professor, he is a photographer, whose work has appeared in many publications in the US and Europe. He is the author of The Opening of a New Landscape: Columbia Glacier at Mid-Retreat, published by the American Geophysical Union in 2007.