Major research interests are in the area of stochastic modeling of surface hydrologic and geomorphologic processes. Current areas of research include modeling and estimation of space-time rainfall from spaceborne sensors, seasonal precipitation forecasting using observations and climate models, stochastic theories of transport on the Earth's surface, river network dynamics and hydrologic response. All these research topics have the common thread of exploring space-time statistical signatures over a range of scales and relating them to the underlying physical processes. Modeling is pursued using minimal complexity models that explore re-normalization and patterns.