Professor Hellard is an infectious disease physician, public health physician and researcher; she is recognised as a global leader in epidemiology and clinical care especially in the fields of hepatitis C and HIV among key populations, and for using new technologies in health promotion. Her work has directly informed policy direction and practice in Australia and globally. Her research experience, paired with her clinical and public health expertise has led to roles on numerous national and international advisory committees, taskforces and working groups, including being current co-Chair of the WHO Strategic and Technical Advisory Committee on HIV and Viral Hepatitis.