Robert Spence is Emeritus Professor and Senior Research Investigator, Department of Electrical & Electronic Engineering, Imperial College London. Professor Spence has been teaching electronic circuits and devices, mainly at first year level, at Imperial College since 1962. He is actively involved in research, especially in the areas of circuits and Human-computer Interaction. He has a PhD and two doctorates, and a Fellowship of the Royal Academy of Engineering. He has had nine books published in the past, mainly concerned with circuits and the recent ones with the topic of information visualization.