William Gummow

Gummow was born in Sydney on 9 October 1942. He completed secondary education at Sydney Grammar School and graduated from the University of Sydney with a Bachelor of Arts and a Master of Laws, both with first-class honours. One of his lecturers was Sir Anthony Mason.

Admitted as a solicitor in New South Wales in 1966, he practised with Allen Allen and Hemsley and became a partner in 1969. His practice ranged across banking, trusts, revenue, intellectual property, commercial transactions and some constitutional law.

Called to the New South Wales Bar in 1976, he developed a practice in equity, commercial, tax and intellectual property matters, appearing in large constitutional cases as junior to Solicitor-General Maurice Byers. He was appointed Queen's Counsel in 1986.

In 1986 he was appointed to the Federal Court of Australia, serving until his elevation to the High Court in 1995. He later reflected on that decade in an oral history interview for the Federal Court's Lives and times of the judges series.

Appointed a Justice of the High Court on 21 April 1995, he served until 8 October 2012. He succeeded Sir Gerard Brennan on the Court and was himself succeeded by Stephen Gageler. He was widely regarded as a central member of the Court's majorities across constitutional and private law.

His judgments emphasised statutory text and doctrinal history. Notable opinions and joint judgments associated with his tenure include Breen v Williams, Kable, Wik Peoples, Hill v Van Erp, Pyrenees Shire Council v Day, Roxborough v Rothmans and Al-Kateb v Godwin, together with leading intellectual property decisions.

For thirty years he lectured in equity at Sydney Law School. He co-authored Equity: Doctrines and Remedies and Jacobs' Law of Trusts in Australia, delivered the Clarendon Lectures at Oxford in 1999 (published as Change and Continuity), and after retirement taught as a professor at Sydney and ANU.

On 8 April 2013 he was appointed a Non-Permanent Judge of the Hong Kong Court of Final Appeal from other common law jurisdictions. He sat on the Court on many occasions, most recently in May 2026, and authored judgments that the Hong Kong Judiciary said had greatly enriched its jurisprudence.

He was appointed a Companion of the Order of Australia (AC) in 1997, Australia's highest civil honour, in recognition of his service to the law and the judiciary.

Gummow was unmarried and protective of his private life. In 2018, after a long-haul flight, he suffered a blood clot and had part of a leg amputated in Sydney. He remained active in judicial and academic work thereafter.

He died in Sydney on 17 September 2026, aged 83. The High Court of Australia issued a media release recording sadness at the passing of Bill Gummow, and the Hong Kong Judiciary likewise expressed deep sadness and extended sympathy to his family.

Gummow left an unusually complete imprint on Australian private law: as co-author of the leading equity treatise, as a High Court justice whose opinions still structure doctrine, and as a teacher and Hong Kong CFA judge who carried Australian equity learning into comparative common-law courts.