I am a philosopher of medicine, and Associate Professor (Education) and LSE100 Co-Director. My research focuses on Evidence-Based Medicine, hierarchies of evidence, and other problems related to evidence and ethics in biomedical research. In particular, I have focused on hierarchies of evidence, an influential tool for ranking and evaluating the quality of evidence from clinical trials and other forms of medical research. My work is interdisciplinary and brings together perspectives from clinical practice with philosophy, policy, ethics and methodology. I am also interested in issues relating to genomic and "personalised" medicine, and questions of demarcation between science and pseudo-science, particularly with respect to complementary & alternative medicine.