Paul's interests are diverse. He is currently interested in the dynamics of anastomosed rivers, palaeofloods - especially Quaternary megafloods, a Quaternary meteorite impact in SE Asia and desert river dynamics. Current projects include: 1) Application of graph theory to pattern analysis of anastomosed river networks; 2) Palaeofloods in China, including recent developments along the Tsangpo and Parlung Rivers in Tibet. 3) Lake drainage history recorded in the palaeoshorelines of ice-dammed lakes, Altai, Siberia; 4) Glacier surging in the Karakorum and the prediction of glacial lake outburst floods (GLOFs); 5) Stratigraphic signature of the 800ka Quaternary meteorite impact in Indochina; 6) Erosion history of mountains in Eastern Egyptian Desert, flooding history in wadis and alluvial fans as indicators of past climate change in Egypt, Israel and Jordan; 7) Gravel bedforms and ventifacts in Iceland.