Justin's research has primarily been conducted in sub-Saharan Africa, including South Africa, where his PhD research and postgraduate projects were undertaken, and in Zimbabwe, where his more recent research has been situated. Between 2011 and 2017, Justin worked with a research institute called the South African Tuberculosis Vaccines Initiative (SATVI), which runs TB vaccine trials in the Western Cape. Justin’s PhD thesis explored the effects of these trials on health seeking and delivery, care relations (especially between nurses and patients) and people's attempts to live healthy, moral, and respectable lives in a context of profound social and economic marginalisation.

Since joining LSHTM in 2017, Justin’s research has been primarily in the fields of antimicrobial resistance and multimorbidity. As part of the AMR Centre and the Anthropology of AMR Research Group, Justin has been involved in a range of research, public engagement, and capacity building projects, most notably as social science coordinator of the FCDO-funded FIEBRE study in Africa and Asia, and as co-investigator on a Wellcome Trust study examining the effects of mass typhoid vaccination on antimicrobial prescribing in Harare.

More recently, Justin’s work has turned to chronic disease and specifically the rising global concern with multimorbidity. Supported by a Wellcome Trust Research Fellowship and in collaboration with the Organisation for Public Health Interventions and Development (OPHID), Justin is working across a range of disciplines and fields of expertise to co-produce a cross-disciplinary framework for conceptualising and responding to multimorbidity in Zimbabwe. As part of his fellowship, Justin has helped to establish and run the LSHTM Multimorbidity Interest Group within the Centre for Global Chronic Conditions and the Africa Multimorbidity Alliance. He supervises four students in Zimbabwe and South Africa working on multimorbidity, antimicrobial resistance, COVID-19, and tuberculosis.