He came to Dartmouth in 2008. Hawley leads the Glaciology Research Group at Dartmouth, mentoring five graduate students and a postdoctoral researcher. The group studies the formation and make-up of polar ice sheets to explore issues related to sea level rise and climate change. Hawley developed a new technique for studying polar firn, called Borehole Optical Stratigraphy, which involves lowering a video camera into a borehole in the ice. The camera records patterns of light and dark in the walls of the borehole, which reflect differences in ice grain size and density and facilitate the studying of annual layers.