Siân is currently VP, Head of Global Clinical Operations and interim Head of Analytics & Data Sciences at Biogen, where she leads large global teams accountable for the strategic planning, execution and analysis of clinical trials across all phases of development in the therapeutic areas of MS/Immunology, Neuromuscular Disorders, Neurodegenerative Disorders and Therapeutics Development (Neurovascular therapies, Psychiatry, and Genetic Neurodevelopmental Disorders). Siân and her team are driving numerous innovation projects to transform clinical trials and accelerate clinical development. Prior to Biogen, Siân spent 20+ years Pfizer, where she held leadership roles in Clinical Development & Operations, Medical Writing, Preclinical Safety (Toxicology and Safety Pharmacology), Safety Risk Management and Regulatory Strategy, managing projects throughout development stages from research to post-approval in multiple therapeutic areas (including Oncology, Neurology, Psychiatry, Pain, Rare Disease, Immunology, Internal Medicine and Vaccines). Sian has a PhD in Pharmacology from the University of Cambridge (1996) where she also held post-doctoral research and academic posts.