Tim focuses on the sociology of health using qualitative methods. His work concentrates on the social relations of access to care, especially in relation to drug use, addictions, HIV and hepatitis C. His recent and current qualitative research explores the implementation of harm reduction and health care interventions among people who inject drugs in East Africa, Colombia and Myanmar. He is currently also focused on the development of critical approaches, informed by science and technology studies, to the study of implementation science, including in the fields of COVID-19, hepatitis C and disease control. As part of this work, he is exploring the evidence produced by mathematical models in policy and public responses to viral infections and outbreaks. He also holds an appointment as Professor of the Sociology of Health at the University of New South Wales (Australia).