The Hon William Gummow AC (1942-2026).

William Montague Charles Gummow was born in Sydney on 9 October 1942. He died aged 83, his death announced by the High Court of Australia on 17 September 2026. He sat on the High Court for seventeen years, and he came to it as one of the most learned equity lawyers of his generation. His name is on the spine of the books that Australian lawyers still reach for when a question of equity or trusts arises.

He was, in the words of the High Court on his death, "a deeply learned, rigorously analytical and highly collegiate member of the High Court." The Court said he had contributed greatly, in that role and across his professional life, to the content and direction of Australian law, and that it would hold a ceremonial sitting in his honour.

From Sydney Grammar to the New South Wales Bar.

Gummow was educated at Sydney Grammar School and then at the University of Sydney, where he took a Bachelor of Arts and a Master of Laws, both with first-class honours. Among his law teachers was Sir Anthony Mason, later Chief Justice of the High Court. He began in practice as a solicitor at Allen Allen and Hemsley, was admitted in 1966 and became a partner of the firm in 1969, working across banking, trusts, revenue law, intellectual property and commercial matters.

After ten years as a solicitor he was called to the New South Wales Bar in 1976. At the Bar his practice ran to equity, commercial disputes, tax and intellectual property, and to large constitutional cases, in several of which he appeared as a junior to the Commonwealth Solicitor-General, Sir Maurice Byers. He took silk as a Queen's Counsel in 1986.

A teacher of equity for thirty years.

From the year he graduated until his appointment as a judge, Gummow taught at the Sydney Law School, lecturing in equity from 1970 to 1995. Generations of Sydney law students learned the subject from him. He held the view that statutes and legal history were taught too lightly in Australian law schools, and he argued that legal education needed teachers who had seen the law in practice.

His scholarship outlasts him. With Roderick Meagher and John Lehane he wrote Equity: Doctrines and Remedies, first published in 1975 and known to practitioners simply as Meagher, Gummow and Lehane, still the leading Australian text on the subject. He co-authored Jacobs' Law of Trusts in Australia and, with Dyson Heydon and Robert Austin, editions of Cases and Materials on Equity and Trusts. In 1999 he delivered the Clarendon Law Lectures at Oxford, later published as Change and Continuity: Statute, Equity and Federalism, which took up the themes that ran through his judging.

The Federal Court and the High Court.

Gummow was appointed to the Federal Court of Australia in 1986, and sat there for nine years. On the nomination of the Keating government he was appointed to the High Court of Australia in April 1995, succeeding Sir Gerard Brennan. He retired on 8 October 2012, on reaching the retiring age of 70 fixed by section 72 of the Constitution, and was succeeded by Stephen Gageler.

His judgments are marked by close attention to statutory language and by a scholarly working-through of the history of a doctrine. He often wrote jointly, most frequently with Justice Kenneth Hayne, and the statistics of his years on the Court show him almost always in the majority. Michael McHugh, who sat with him for a decade, once called him a great judicial politician, a reference to his skill in bringing other members of the Court to his view.

The judgments he is remembered for.

Selecting individual judgments is hard, because Gummow so often wrote with others. But several decisions carry his mark. In Kable v Director of Public Prosecutions (NSW) [1996] HCA 24 he was in the majority that struck down a New South Wales law framed to keep one named man in prison by preventive order. The reasoning, that a State court cannot be given a function incompatible with its role as a court in which federal jurisdiction is vested under Chapter III of the Constitution, became the Kable principle. It has since been at the centre of challenges to preventive detention, control orders and other laws that lean on the courts, so it reaches directly into criminal practice.

In The Wik Peoples v Queensland [1996] HCA 40 he joined the majority that held pastoral leases did not necessarily extinguish native title, and that the two could coexist, with the rights of the pastoralist prevailing where they conflicted. In Breen v Williams (1996) 186 CLR 71 his judgment set limits on how far the law of fiduciary duty could be stretched, in a case about a patient seeking access to her own medical records.

His equity learning showed in the law of restitution. In Roxborough v Rothmans of Pall Mall [2001] HCA 68 he was cautious about treating unjust enrichment as a governing principle, preferring the established ground of a failure of consideration. And in Al-Kateb v Godwin [2004] HCA 37 he dissented, holding that the Migration Act should not be read to permit the indefinite detention of a stateless person who could not be removed. He was in the minority, but the case is still argued over, and his dissent is part of why.

Hong Kong's Court of Final Appeal.

After the High Court, Gummow did not stop judging. In 2013 he was appointed a non-permanent judge of the Court of Final Appeal of Hong Kong, one of a number of senior judges from other common law countries who sat on that court. He continued in the role for more than a decade, sitting last in May 2026. He also held professorships at the Sydney Law School and the Australian National University, teaching in constitutional law, equity, conflict of laws and refugee law, and continued to lecture and write.

Honours.

Gummow was appointed a Companion of the Order of Australia, the country's highest civil honour, in 1997, for service to the law. He was awarded the Centenary Medal in 2001, and the University of Sydney conferred on him an honorary Doctor of Laws. He was known for guarding his private life, and let his work speak for him.

Tributes.

The High Court described him as "a deeply learned, rigorously analytical and highly collegiate member of the High Court," and said he had contributed greatly to the content and direction of Australian law. The President of the Law Society of New South Wales, Ronan MacSweeney, said Gummow had made "an indelible impact on Australia's justice system," and had spent his career "shaping the law and inspiring generations of lawyers to come."

For those who practise, his memorial is on the shelf and in the reports. A student who learns equity today learns much of it from a book he wrote, and a lawyer who argues a Chapter III point stands on ground he helped to lay.

Frequently asked.

Who was William Gummow?

The Hon William Gummow AC (1942-2026) was an Australian judge, barrister and legal scholar. He was a Justice of the High Court of Australia from 1995 to 2012, a judge of the Federal Court from 1986, a leading equity barrister, and a co-author of the standard Australian texts on equity and trusts. From 2013 he was a non-permanent judge of the Court of Final Appeal of Hong Kong.

When was he appointed to the High Court?

In April 1995, on the nomination of the Keating government, succeeding Sir Gerard Brennan. He retired on 8 October 2012 at the constitutional retiring age of 70, and was succeeded by Stephen Gageler.

What is he best known for?

His scholarship and judgments in equity, trusts, intellectual property and public law. He co-authored Equity: Doctrines and Remedies and Jacobs' Law of Trusts in Australia, and sat on decisions including Kable v DPP (NSW), Wik Peoples v Queensland, Breen v Williams and his dissent in Al-Kateb v Godwin.

What was his role in the Kable case?

He was in the majority in Kable v DPP (NSW) [1996] HCA 24, which struck down a NSW law that singled out one person for preventive detention. The Kable principle, that a State court cannot be given functions incompatible with its role under Chapter III of the Constitution, has since shaped challenges to preventive detention and control order laws.

When did William Gummow die?

His death, at the age of 83, was announced by the High Court on 17 September 2026. He was born on 9 October 1942 in Sydney. The High Court said it would hold a ceremonial sitting in his honour.

Sources.

• High Court of Australia, The Hon William Montague Charles Gummow AC, and the Court's media release of 17 September 2026.
• Law Society Journal, Tributes flow for former High Court Justice the Hon. William Gummow AC, 18 September 2026.
• Kable v Director of Public Prosecutions (NSW) [1996] HCA 24; The Wik Peoples v Queensland [1996] HCA 40; Breen v Williams (1996) 186 CLR 71; Roxborough v Rothmans of Pall Mall [2001] HCA 68; Al-Kateb v Godwin [2004] HCA 37, reported reasons on JADE.
• John Lehane, "Gummow, William Montague Charles," in The Oxford Companion to the High Court of Australia (Oxford University Press, 2001).
• William Gummow, Wikipedia.

To speak to a criminal defence lawyer, call Aaron Kernaghan on 0421 717 019.

This is a factual tribute compiled by Aaron Kernaghan, criminal defence lawyer at Brady & Associates Lawyers, from the public sources listed above, as at 19 September 2026. It is not legal advice. If you notice an error, please contact the firm and it will be corrected.

More criminal-law commentary by Aaron Kernaghan.

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