Called to the Bar in 2006, Theresa maintains a specialised practice in public administrative law. Her practice also extends to appearing in commercial and equity matters.

The depth and breadth of her practice has seen Theresa advise and appear for individuals, companies, organisations and the Crown, in a wide range of disputes, particularly in migration law, encompassing all aspects of judicial review and challenging the decision of governments. Briefed to appear in test cases that create new law, some of the matters in which Theresa has appeared have become landmark decisions and are regularly referenced in courts today. Her international experience extends to appearances in the Supreme Court of Nauru, and notably Theresa was a member of a panel of barristers appearing in this jurisdiction. Theresa has also appeared for the Commonwealth Director of Public Prosecutions in criminal matters and she is also on their panel for junior barristers.

An experienced advocate, Theresa has appeared unled in various jurisdictions, including the Full Federal Court of Australia, Federal Court of Australia, Supreme Court of New South Wales and other inferior State courts and tribunals, including the Administrative Appeals Tribunal. Significantly, she has also appeared unled on a special leave application in the High Court of Australia and as a junior barrister in proceedings before the High Court.

Prior to being called to the Bar, Theresa gained considerable commercial litigation and transactional experience as a solicitor at major Sydney firms, including Minter Ellison. She holds a Master of Commerce from Macquarie University, and a Bachelor of Laws (with First Class Honours) and a Bachelor of Economics from Sydney University. She has delivered numerous papers and authored several articles in her fields of practice.

Theresa has been a long-term meditator and is passionate about spreading the benefits of meditation to her fellow barrister and teaches a weekly lunchtime meditation class in her chambers.