Professor Hugh Durrant-Whyte has made major contributions in two evolving fields: autonomous vehicle navigation and sensor data fusion. His work has led to significant applications; for example the AutoStrad system which is now being used to load containers onto ships. He also pioneered research in the now popular Simultaneous Localisation and Mapping (SLAM) area. In each case he has pioneered the mathematical development of the field, published a number of high-impact contributions, and, importantly, has led developments through to commercial implementation. His (large) research group has become a world leader in navigation systems research for outdoor vehicles.