My main research interests are focused on inferring the viscoelastic strength of the lower crust and upper mantle, determining how this rheology influences the evolution of stress through the earthquake cycle, and understanding how this evolution influences earthquake occurrence. I use GPS and other geodetically observed surface deformations to constrain 3-D finite element models of coseismic, postseismic. and interseismic processes. My work also extends to planetary science and the fate of subducting slabs.