Alasdair Rae is a Professorial Fellow in Urban Studies and Planning at the University of Sheffield. His work focuses on the manipulation, analysis and visualisation of large geographic datasets in relation to urban planning, transport, policy and land issues. More generally, he is a proponent of open data and in his work seeks to make use of the wide range of new datasets that have become available in recent years to advance knowledge in policy-relevant areas. His work has appeared in a variety of media outlets, including The Economist, Huffington Post, CityMetric, WIRED, The Guardian, The Royal Statistical Society magazine and the BBC. He tweets at @undertheraedar and blogs at www.statsmapsnpix.com.