Matthew has particular expertise in administrative and constitutional law, privileges and immunities, commissions and inquiries, and information protection.

Matthew appears in most Commonwealth and New South Wales courts and tribunals, including the High Court of Australia, the Federal Court of Australia (both appellate and original jurisdiction), and the Supreme Court of New South Wales.

Matthew practiced as a solicitor at the Australian Government Solicitor between 2013 and 2019, where he conducted significant and complex litigation for a wide range of Commonwealth agencies. He was seconded to the Royal Commission into Institutional Responses to Child Sexual Abuse, and was part of the team representing Commonwealth agencies in the coronial inquest into the Lindt Cafe siege.

Matthew was tipstaff to the Honourable Justice John Basten of the New South Wales Court of Appeal in 2012.

Matthew has experience as both an advocate and conciliator in alternative dispute resolution settings, and served as Executive Secretary to the Australian Dispute Resolution Advisory Council between 2016 and 2017.