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Premier glaciologist Almut Iken recently retired after conducting research at the Swiss Federal Institute of Technology (ETH) in Zurich for 25 years. To honor her many important contributions to glaciology, approximately 80 colleagues from many parts of Europe and North America participated in a special session at the 1996 AGU Fall Meeting in San Francisco to explore the role of water in ice dynamics, a topic that Iken significantly advanced. Iken's pioneering work in Greenland, the Canadian Arctic, Antarctica, Alaska, and the Swiss Alps explained how englacial and subglacial water affects the dynamics of ice masses. Her research is fundamental to understanding the behavior of ice streams—which drain the major ice sheets—the cycling of glacier surges, and the seasonal movement of alpine glaciers.