I am a pharmacoepidemiologist using multinational electronic health records (EHRs) for causal inference research. I studied BSc Public health at the Chinese University of Hong Kong and a PhD in pharmacoepidemiology at the University of Hong Kong. I then moved to London to work at LSHTM in 2018. I have conducted epidemiological and pharmacoepidemiological research across diverse healthcare systems in UK, Hong Kong, Japan and Denmark. I am also a member of OpenSAFELY collaborative to work on COVID-19 research especially during early stage of pandemic. My research has been supported by several funding bodies including British Heart Foundation for investigating drug-interaction with direct oral anticaogulants, MRC grant and Hong Kong InnoHK grants, supporting the development and application of methodologies in EHR-based research. I'm currently the deputy director of the Centre for Global Chronic Conditions.