I am a Wellcome Programme Senior Fellow and a Clinical Epidemiologist with the London School of Hygiene and Tropical Medicine. My main research interests concern HIV and TB in HIV prevalent populations from the public health perspective, with a focus on primary care and community level diagnostic interventions. I work closely with the World Health Organization, with previous membership of the Strategic and Technical Advisory Group for the TB Programme. My research has highlighted the public health importance of undiagnosed infectious TB and community-level interventions providing access to TB and HIV diagnosis.  I have ongoing research in self-testing for HIV, TB diagnostic impact evaluations, and spatial epidemiology of TB.