He uses geophysical techniques such as active-source seismology and measurements of subtle changes in Earth’s gravity field to image what’s underneath ice sheets and glaciers and how they influence the rate of ice flow from land to ocean. His work has taken him to many corners of the Antarctic and Greenland Ice Sheets over the past decade. He has a Ph.D. in Physical Geography from the University of Colorado, Boulder and M.S. and B.S. in Geosciences from Chiba University in Japan.