Dr. Yvonne Greenstreet is Chief Operating Officer of Alnylam Pharmaceuticals. She possesses 25 years of global experience in the pharmaceutical industry, where she has been in senior roles in research and development, strategy, and portfolio management. Yvonne was previously Senior Vice President and Head of Medicines Development at Pfizer, and a member of the executive team for the specialty business, with accountability for a portfolio that included the immuno-inflammation, vaccine, specialty neuroscience, and rare disease areas. Prior to Pfizer, Yvonne held roles of increasing responsibility at GlaxoSmithKline, including Senior Vice President and Chief of Strategy for Research and Development, Senior Vice President for Medicines Development and Chief Medical Officer for Europe. Yvonne received her medical degree (MBChB) from the University of Leeds, UK, and an MBA degree from INSEAD, France. She serves as a member of the board of directors of Pacira Pharmaceuticals, Inc., a specialty pharmaceutical company, and Indivior PLC, a global specialty pharmaceutical business. Dr. Greenstreet also serves on the Scientific Advisory Committee of the Bill and Melinda Gates Foundation.