My research focuses on the intersection between geology and water, from caves to aquifers. Using stalagmites I reconstruct past climates, past groundwater recharge, and past fire history. I characterise organic matter in natural and human environments, from groundwater to drinking water. Common themes include an interdisciplinary scientific approach between the subject areas of Environmental Earth Science and Engineering, and the use of isotopic and geochemical techniques. I have published over 260 internationally refereed papers in high citation-rate journals including Nature, Science, Nature Communications and Nature Geoscience. I have been awarded, and have successfully managed over 75 successful research grant applications. I was awarded a Millennium Awards Fellowship in 1999, a Phillip Leverhulme Prize for Geography in 2003, a Durham University Institute for Advanced Studies Fellowship in 2009, and the Fred L. and Frances J. Oliver Lectureship in Texas Hydrology and Water Resources in 2015. In 2021 I was awarded Fellowships of the Australasian Cave and Karst Management Association and the American Geophysical Union. My H index is between 689 (Scopus) and 81 (Google Scholar).