Richard B. Alley, Professor of Geosciences at Pennsylvania State University, where he teaches and conducts research on climate change and glacier behavior. A Fellow of the American Geophysical Union, he recently chaired the National Research Council committee that produced the report "Abrupt Climate Changes: Inevitable Surprises." He has won both teaching and research awards for his work, which has included five expeditions to Greenland and three to Antarctica. He has published numerous articles in leading journals such as Science, Nature, and Scientific American.