Andrea Saltelli has worked on physical chemistry, environmental sciences, applied statistics, impact assessment and science for policy. His main disciplinary focus is on sensitivity analysis of model output, a discipline where statistical tools are used to interpret the output from mathematical or computational models, and on sensitivity auditing, an extension of sensitivity analysis to the entire evidence-generating process in a policy context. A second focus is the construction of composite indicators or indices. Till February 2015 he led the Econometric and Applied Statistics Unit of the European Commission at the Joint Research Centre in Ispra (I), developing econometric and statistic applications, mostly in support to the services of the European Commission, in fields such as lifelong learning, inequality, employment, competitiveness and innovation. He participated to the training of European Commission staff on impact assessment. At present he is at the European Centre for Governance in Complexity, a joint undertaking of the Centre for the Study of the Sciences and the Humanities (SVT) - University of Bergen (UIB), and of the Institut de Ciència i Tecnologia Ambientals (ICTA) -Universitat Autonoma de Barcelona (UAB). His recent publications include a series of papers on the ecological footprint, on the use of statistical or mathematical models for policy, and a book entitled ‘Science on the Verge’.