His research has focused on hydrogeology, contaminant transport, and groundwater remediation. Dr Carroll has published more than 25 refereed journal articles and symposium proceedings papers. At NMSU, he supports the environmental and soil science focus areas, and his teaching and research background and interests cover a broad range of areas that pertain to the coupling of hydrobiogeochemical processes that mediate exchange of water and chemicals between the hydrosphere, lithosphere, and biosphere.