Brian Horton is a professor in the Department of Geological Sciences and Institute for Geophysics at the University of Texas at Austin. His research addresses sedimentary basin development and mountain building processes. He utilizes methods in sedimentology, stratigraphy, and geochronology to understand modern and ancient sedimentation, river drainage patterns, sediment provenance, and orogenesis. Much of his research has focused on the geologic evolution of the Andes and associated sedimentary basins and major river systems of South America. For this project, Dr. Horton will be addressing questions related to the history of erosion and sedimentation in relationship to changes in tectonic processes in the Colombian Andes.