Susan Stillman is a hydrometeorologist, interested in land-atmosphere interactions and the impacts of climate change on regional hydrology. Much of her research is focused on observing the terrestrial water cycle: evaluating and improving the current observing system. In order to improve the quality and spatiotemporal resolution of hydrologic data, she combines data from a variety of sources, including satellites, in situ measurements, and models. Motivated by inconsistency among climate model projections of precipitation in the western US, Susan has become increasingly interested in understanding the synoptic-scale systems that bring precipitation to this region and the interaction of these systems with complex topography. A key goal of her current research is to identify ways in which atmospheric conditions that influence orographic precipitation could change in future climate scenarios.