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I was awarded both a BSc in Engineering Science (1st class) and a PhD in Robotics (1990) by the University of Durham, UK. My PhD work developed steering control systems and ultrasonic guidance systems for mobile robots. I then worked in the Robotics Research Group, University of Oxford (1990-1994), developing novel 3D active sensor systems, before moving to the Speech, Vision and Robotics Research Group, University of Cambridge, where I was a fellow of Girton College (1994-1998). Here I developed algorithms for mobile robot guidance using active range sensors. In 1998 I moved to my current position at the Department of Computer Science, University of York, and my research interests shifted to Computer Vision and Pattern Recognition. My current main interests are focussed on (i) 3D shape analysis, with emphasis on 3D face applications (ii) vision-based surveillance and (iii) vision-based human-computer interaction.