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Annaliesa A. serves as the Senior Vice President and Chief Scientific Officer for Pfizer Vaccine Research and Development, with a tenure at Pfizer dating back to July 2007. Prior roles at Pfizer include Senior Vice President and Chief Scientific Officer for Bacterial Vaccines and Hospital, and Vice President positions focused on bacterial vaccines. Annaliesa's previous experience includes a significant tenure at Merck and Co Inc from 1998 to 2007, where leadership of the Microbial Vaccines Research team involved overseeing 30 scientists and managing multiple vaccine programs from conception to clinical proof of concept. Annaliesa's academic credentials include a PhD in Biology/Biological Sciences from the University of Warwick, complemented by a Bachelor of Science in Biological Sciences from The Manchester Metropolitan University.