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Hugo Zaragoza is a researcher working on Information Retrieval at Yahoo! Research Barcelona. From 2001 to 2006, Hugo worked at Microsoft Research (Cambridge, UK) with Stephen Robertson, mostly on probabilistic ranking methods for corporate and web search, but also on document classification, expert finding, relevance feedback, and dialogue generation for games. He also spent a considerable amount of time collaborating with Microsoft product groups such as MSN-Search and SharePoint Portal Server. Prior to Microsoft Research, Hugo taught computer science and completed a Ph.D. at the LIP6 (U. Paris 6) on the application of dynamic probabilistic models to a wide range of Information Access problems.