Dr Arash Ghanbarzadegan is a lecturer and research fellow at the University of Sydney. He is also an adjunct lecturer at the Australian Research Centre for Population Oral Health, The University of Adelaide. Dr Ghanbarzadegan introduced a new concept model of inequality in dental services (i.e. Triangle of Inequality in Dental Services). Arash added new insights into the counterfactual multiple mediation and sensitivity analysis using the Ratio of Mediator Probability Weighting (RMPW) approach. In addition to his role at Sydney Dental School, he collaborates with the Menzies Centre for Health Policy and Economics, The University of Sydney. In his roles, he works closely with institutional partners such as the Centre for Oral Health Strategy and NSW Health. He is responsible for quantitative policy analysis and supports the evaluation team of the Primary School Mobile Dental Program.