It gives us great pleasure to see Shin-Chan Han receive AGU's 2009 Geodesy Section Award, presented to a young scientist for major advances in the field of geodesy.
Shin-Chan burst upon the geodetic scene just before the launch of the Gravity Recovery and Climate Experiment (GRACE) satellites, and the timing could not have been more propitious—both for Shin-Chan and for the GRACE project. His doctoral thesis at Ohio State University dealt with efficient methods for determining gravity from satellite-to-satellite tracking data, of the sort GRACE was soon providing. Soon thereafter a remarkable series of papers began to appear, as Shin-Chan exploited the new time-variable gravity measurements for applications ranging from surface water hydrology, to earthquake deformation, to ocean tides. All of these used new and highly original methods for extracting signals from the basic satellite tracking data. His analysis of the gravity changes associated with the great 2004 Sumatra earthquake was a revelation to many, for it emphasized the power of satellite gravity data to complement seismology, for example, by constraining the long-wavelength viscoelastic relaxation and subsequent stress redistribution.