Ian Reid’s work over two decades has broken new ground in computer vision, a field of information engineering that intersects with graphics, machine learning, AI and robotics. His work spans a broad spectrum of the field, with landmark contributions in visual geometry, tracking, novel-view synthesis, visual surveillance, and simultaneous localisation and mapping. His emphasis on real-time processing and systems work means that he is one of few researchers worldwide to be active in both the Computer Vision and Robotics communities, and his work has been instrumental in bringing computer vision into the mainstream of the robotics literature.