Forensic expert specialising in dispute resolution, forensic investigations and regulatory response.

Siobhan is a Forensic expert with more than 20 years of experience specialising in dispute resolution, forensic investigations, regulatory response and labour force reviews.

Prior to joining McGrathNicol, Siobhan was a Partner at 'Big 4' firms and brings a depth of experience in investigating allegations of misconduct, quantification of damages and presentation of evidence. Siobhan is regularly engaged as an expert accountant to opine on matters of quantification and provides expert evidence (written and oral) in forums such as Senate Inquiries, the Federal Court of Australia, the Supreme Court (across various states), Victorian Civil and Administrative Tribunal, and the Fair Work Commission. She has also assisted clients through mediation and other forms of alternative dispute resolution.

Siobhan advises Boards, Risk Officers and C-Suite executives regarding best practice for managing misconduct, litigious issues and risk mitigation. She has worked across a range of industry sectors including financial services, healthcare, government, property, retail and manufacturing.

“I am passionate about providing balanced and unbiased advice to clients who are responding to complex accounting and litigious issues and assisting them to navigate the dispute resolution, investigation or regulatory process.”

Siobhan Hennessy

Qualifications & memberships

  • Member, CA ANZ

  • Bachelor of Economics, Sydney University

Board roles

  • Board Member, McGrathNicol