I am a specialist in volcanology and the characterisation of volcanic ash (tephra) layers to date and correlate sedimentary records. My current research focusses on building detailed records of the composition of explosive volcanism across the globe such that ash layers can be used for far-reaching chronology in both space and time. I am particularly interested in the frequency, size and impact of large eruptions, and the magmatic processes in the lead up to these events. I am currently working on collaborative projects in Mexico, Italy, Japan, Azores and Canary Islands (see links below). I head the Tephrochronology Research Group and manage the facilities to chemically characterise the volcanic deposits (electron microprobe) and a laboratory to identify non-visible ash layers (cryptotephra).