Dr Mark Zirnsak joined the Uniting Church in Australia, Synod of Victoria and Tasmania, in 1999 as the Social Justice Officer. In 2004 he became the Director of the social justice unit and in 2018 became the Synod Senior Social Justice Advocate. He was one of the founders of the Tax Justice Network Australia and the Synod remains the secretariat for the Network. He is an expert adviser to Transparency International Australia. He is also on the Federal Government Modern Slavery Expert Advisory Group and the Attorney General’s National Roundtable on Slavery and Human Trafficking. He has a PhD in chemical engineering and worked in the mining industry prior to joining the Uniting Church.