John de Wit (MSc, PhD) is professor and director of the Centre for Social Research in Health at the University of New South Wales, Sydney. John has been undertaking and leading behavioral and social research regarding HIV, STI and sexual health for over 20 years, and his expertise and interest is especially with theory-informed research into the individual, social and structural factors that shape effective prevention, diagnosis and treatment. John is passionate about contributing to the translation of research findings into policies, programs and services, and his research program encompasses the development and testing of innovative intervention approaches and investigations of the practices, experiences and support needs of service providers. Reflecting his research leadership and broad interests, John has published widely across a range of topics and in esteemed peer-reviewed journals. He also is actively involved in various national and international advisory and organizing committees.