Sarah Gallacher is a Senior Research Associate in the Department of Computer Science at UCL. She joined UCL as a post-doc in early 2013 from Heriot-Watt University (HWU) in Scotland, Edinburgh. At HWU she achieved an MEng in Software Engineering in 2005 and a PhD in Computer Science in 2011. In addition, Sarah worked on several EU research projects from 2005 - 2012, collaborating with researchers from all over Europe. Sarah conducts research in the area of pervasive/ubiquitous computing, personalisation and applied machine learning. Previously she has developed personalisation and preference learning systems for pervasive service platforms and has also developed several pervasive services and applications. She has published more than 30 papers, in venues including Ubicomp, Pervasive, Mobiquitous, UIC, the Journal of Pervasive and Mobile Computing (PMC) and ACM Transactions on Autonomous and Adaptive Systems (TAAS). Current research interests in the Cities domain include crowd sourcing and data mining.