I am a physical geographer with teaching and research interests at the interface of geomorphology, climatology, history and archaeology. My current interests are in two main areas:

• Understanding the chemical properties of the silica-cemented duricrust silcrete and using this knowledge as part of archaeological stone sourcing investigations in southern Africa and the Stonehenge landscape (UK).
• Establishing patterns of climate variability in southern Africa over the last 200-300 years through the analysis of historical documents such as newspapers, letters and diaries.

I have authored more than 100 publications, including two edited books, Geochemical Sediments and Landscapes (Wiley-Blackwell, 2007) with Sue McLaren (University of Leicester), and Quaternary Environmental Change in the Tropics (Wiley-Blackwell, 2012) with Sarah Metcalfe (University of Nottingham).

My research has been funded by The Leverhulme Trust, Natural Environment Research Council, British Academy, British Society for Geomorphology and The Gilchrist Educational Trust (amongst others). I have successfully supervised eight Doctorate (PhD) research degrees and am currently supervising a further three PhD candidates.

In addition to my post at Brighton I hold an Honorary Research Fellowship  at the University of the Witwatersrand, South Africa. I was presented with the Gordon Warwick Award in 2003 by the British Geomorphological Research Group (now the British Society for Geomorphology) for "excellence in geomorphological research as recorded in a named publication or set of publications".

My current research interests fall into two areas: 1. Understanding the properties of duricrusts and applying this knowledge in archaeological contexts; (2) Unravelling climate histories in southern Africa through the analysis of documentary evidence.

Duricrusts in landscape and archaeological contexts

My primary area of research concerns the development and environmental significance of silcrete duricrusts. The primary goals of this research are to (a) characterise the micromorphology and geochemistry of duricrusts developed in different landscape settings, (b) assess the extent to which duricrusts may be used as indicators of past environments, and (c) apply this fundamental knowledge for use in archaeological contexts. To date, my research has focused mainly upon non-pedogenic silcretes in the Kalahari Desert, central Australia, and the UK, with archaeology-related work in southern Africa and the Stonehenge landscape (UK).

Reconstructing historical climatic change using documentary sources

My second research focus is the reconstruction of past climate variability through analyses of historical documents, particularly missionary and other colonial sources. Working with collaborators in Europe and southern Africa, I have developed novel methodologies to establish chronologies of hydroclimatic variability in the Kalahari Desert, Lesotho, KwaZulu-Natal (South Africa), Madagascar and western India using these materials.

I am interested in supervising postgraduate research students in the following areas: reconstructing historical climate change; arid zone geomorphology; environmental change in southern Africa; silcrete provenancing in archaeology.