Dr. Ronald Green is an Institute Scientist in the Geosciences and Engineering Division at Southwest Research Institute in San Antonio, Texas where he has worked for the past 25 years. His primary activities are in groundwater hydrology and environmental geophysics. Recent work has focused on water availability in south-central and west Texas and the impact of oil and gas activities on water resources. Of particular interest are the water resources of karst limestone aquifers including assessments of recharge, characterization of flow mechanisms, and numerical modeling. Dr. Green is a Fellow in the Geological Society of America and is certified as a Professional Geologist in Texas. He holds a B.S. in Industrial Engineering from the University of Michigan, a B.S. in Geology from Grand Valley State University, a M.S. in Geophysics from the University of Utah, and a Ph.D. in Hydrology from the University of Arizona.