I am interested in the behavior of modern ice sheets and glaciers and what controls their dynamics. Why do they flow more quickly in some areas than in others? How can we observe the properties that control flow? These are outstanding questions for large sectors of both the Greenland and Antarctic ice sheets, and answering them is critical for predicting the behavior of these ice sheets using numerical models. These questions often involve the nature of the ice bottom, where the ice meets hard bedrock, deformable till and/or water. Although the englacial (internal) properties of ice sheets generally exert a weaker control upon ice flow as compared to the bed, studies of ice-sheet stratigraphy and other englacial properties can also produce significant insights into the formation and evolution of an ice sheet.

The above questions lead to my interest in the following broader topics:

Glacier and ice-sheet dynamics; subglacial conditions and geology of Greenland and Antarctica; active and passive geophysical methods; glaciochemistry; dielectric properties of ice; crevasses and calving; geophysical inverse theory; ice-sheet-climate interactions; climate change; extraterrestrial ice masses.