His research is centred on environmental change and archaeology through the Holocene, predominantly (but not exclusively) through pollen-analytical methods. His work primarily focuses on Europe, working on projects in Britain and Ireland, Scandinavia and Italy. He was been a member of the Nordforsk-funded POLLANDCAL (POLlen-LANDscape CALibration) and LANDCLIM (Land-climate interactions) networks, and is currently coordinating efforts to generate state-of-the-art knowledge of Europe-wide Holocene land cover as part of the Past Global Changes (PAGES) LANDCOVER6K working group (hyperlink to LANDCOVER6K).