Research Interests: Earthquake strain accumulation and water resources in metropolitan Los Angeles and California Current plate motions, continental deformation, and tectonics Earth’s elastic and viscous response to ice sheet unloading Changes in water resources in California and North America Velocity of Earth’s center and wander of Earth’s spin axis Space geodesy: Global Positioning System, Very Long Baseline Interferometry, Satellite Laser Ranging, Doppler Orbitography and Radiopositioning Integrated by Satellite, Interferometric SAR, and GRACE