Stewart Grieve
Partner, Corrs Chambers Westgarth

Stewart is the partner in charge of Corrs Chambers Westgarth’s tax controversy practice.  He specialises in advising major publically listed companies on taxation investigations and enquiries, dispute resolution and litigation. Since becoming a tax practitioner in 1990, Stewart has worked in the tax division of a big 4 accounting firm, as a tax partner and practice group leader at Corrs and as head of the global tax function at Foster’s Group Ltd. Stewart’s expertise in dealing with all aspects of large case tax disputes has been recognised in various publications including the International Tax Review’s Tax Disputes / Controversy Leaders Guide.  He has also been recognised as one of Australia’s leading tax lawyers in 2012, 2013 and 2014 in Best Lawyers.

Guest speakers


Stephen Mayne
Consultant, Australian Shareholders' Association, Founder, Crikey and Councillor, City of Melbourne

Stephen is a business journalist by profession who spent 10 years on daily newspapers before founding Australia’s best known independent ezine, Crikey.com, in 2000. He was a press secretary in the early years of the Kennett Government before publishing the anti-Kennett website http://www.jeffed.com during the 1999 state election, thereby commencing a continuing journey as a genuinely independent commentator, shareholder activist and advocate for good governance. Stephen has conducted more than 1000 radio and television appearances over the past 15 years, including three slots on ABC TV’s Q&A program. As Australia’s best known shareholder activist, Stephen has asked questions at more than 400 public company AGMs and stood for 40 public company boards. Since 2011 his advocacy has been conducted through the Australian Shareholders’ Association as a director and then as Policy and Engagement Coordinator. He served more than three years on Manningham City Council before his election to the City of Melbourne in October 2012, where he chairs the Finance and Government Committee and is deputy chair of the Planning Committee. Stephen has lived in five different City of Melbourne residences over the journey, retains a Collins Street office and has a commerce degree from the University of Melbourne. He is 44, married with three children and is determined to deliver on the recently adopted goal in Council’s four year plan to make the City of Melbourne ‘one of Australia’s most open and transparent councils’.

Michael O’Neill
Assistant Deputy Commissioner of International, Public Groups & International, Australian Taxation Office

Michael has worked in a law firm, in a big 4 firm, and with several agencies including the Australian Federal Police, Australian Crime Commission and the Australian Taxation Office. As a lawyer, Michael has acted as prosecutor, investigator, and project leader for multi-agency or multi-jurisdictional projects. After working on international tax matters for almost 8 years, including in Project Wickenby, Michael now leads the International Practice in the ATO.

Mark Zirnsak
Director of the Justice and International Mission Unit, Uniting Church in Victoria and Secretariat, Tax Justice Network Australia

Dr Mark Zirnsak, Director, Justice and International Mission, Synod of Victoria and Tasmania, Uniting Church in Australia The Uniting Church in Australia acts as the Secretariat for the Tax Justice Network in Australia.  The Network sees integrity and transparency in tax as a critical issue as tax evasion removes funding from essential services, infrastructure and key development needs. Mark was employed as the Synod Social Justice Development Officer in the Uniting Church in Victoria and Tasmania in June 1999 and became Director of the Justice and International Mission Unit of the Uniting Church in Victoria and Tasmania in early 2004. He  is active in anti-corruption movements, including Publish What You Pay and Transparency International Australia. He has a PhD in Chemical Engineering from the University of Melbourne and has worked as a research engineer for Rio Tinto.