My interests in chemical and physical processes in the environment were initially focused on groundwater, catchment and hillslope hydrology, channel flow, transport processes and their controls on biological productivity. Over time these interests have expanded to include terrestrial biogeochemical processes, soil dynamics and land-atmosphere interactions.
My research has been largely concerned with the hydrology and biogeochemistry of small lakes and streams and their catchments, and their influence on coastal and estuarine systems. Knowledge of processes operating within these catchment-to-coast systems is essential for understanding the fate of non-point-source pollutants (such as acid rain), for estimating the ecological effects of large-scale environmental perturbations (such as climate change), and for examining the implications of environmental policy (such as land use management).
Underlying my interests in biogeochemical processes and the scales of ecosystem response is a strong commitment to the use of models and quantitative methods for integrating and interpreting research data. I am particularly interested in the development and application of quantitative techniques for studying the dynamic behaviour of large-scale aquatic and terrestrial systems. I use various methods of numerical simulation, time series analysis, statistical inference and hypothesis testing, Monte Carlo simulation and recursive parameter estimation in conjunction with empirical and mathematical models of ecosystem dynamics to identify and quantify the important processes operating within ecosystems. I am particularly interested in using these models as tools for increasing scientific understanding of catchment processes and (through their application at landscape and regional scales) as tools for knowledge transfer and environmental decision-making.
I've enjoyed more than 40 years of research and teaching in the environmental sciences in the US, Canada and Europe. Prior to Joining UKCEH I was Research Professor of Environmental Sciences, Co-director of the Shenandoah Watershed Study Program, and Fellow of Brown College at the University of Virginia (USA). My work has contributed to over 150 peer-reviewed papers which have been cited more than 7,000 times (h-index of 35) leading to recognition as an ISI Highly Cited Researcher in the two fields of Ecology/Environment and Engineering.
Over the years my research has provided opportunities to work with a number of exceptional institutions: Distinguished Visiting Scholar, School of Geography and Environment, Oxford University; Senior Scientific Fellow, Norwegian Institute for Water Research, Oslo, Norway; Honorary Fellow, James Hutton Institute, Aberdeen, Scotland; Libra Visiting Professor of Ecology and Environmental Science, University of Maine, USA; Associate and Adjunct Professor, Nicholas School of the Environment, Duke University, USA; Adjunct Professor, Environmental and Life Sciences Graduate Program, Trent University, Canada; Visiting Professor of Environmental Sciences, Department of Geography, University of Reading, UK.
PhD Environmental Sciences, BS Chemistry, University of Virginia, USA
European Geosciences Union, American Geophysical Union, Soil Science Society of America, British Ecological Society, British Society of Soil Science, Ecosystem Services Partnership, Society of the Sigma Xi