Kelvyn Jones is Emeritus Professor Quantitative Geography at the University of Bristol, UK. He focuses on the quantitative modelling of social science data with complex structure especially in relation to change and health outcomes. He has been awarded Fellowships of the British Academy, the Learned Society of Wales, and the Academy of the Social Sciences. Graham Moon is Emeritus Professor of Health Geography at the University of Southampton, UK. His research focusses on place effects on health-related behaviours, particularly smoking and diet, on mental health care and on small area estimation. He has also published on histories of health geography. He is a Fellow of the Academy of Social Sciences and an Honorary Member of the Faculty of Public Health.