Gleeson was born in Wingham, New South Wales, the eldest of four children. He was educated at St Joseph's College where he won the Lawrence Campbell Oratory Competition in both 1953 and 1955, before matriculating to receive first class honours degrees in Arts and Law from Sydney University. Among his graduating class of 1962 were John Howard, later to become Prime Minister; and Michael Kirby, who served alongside him as a judge on the High Court.
He married Robyn Patterson in 1965, and the couple have four children. Gleeson's daughter, Rebecca, is married to actor Eric Bana.
In September 2006, The Australian Financial Review magazine named Gleeson Australia's seventh most overtly powerful person.
After graduation, Gleeson spent one year as a solicitor at Messrs Murphy & Moloney. Gleeson was admitted to the New South Wales Bar in 1963, where he read with Laurence Street and Anthony Mason - his future predecessors as Chief Justice of New South Wales and Chief Justice of Australia respectively.
His appearances as junior counsel focussed mainly on matters of taxation and commercial law, as well as important constitutional cases including Strickland v Rocla Concrete Pipes Ltd, which concerned the scope of the corporations power.
Upon his appointment as Queen's Counsel (QC) in 1974, Gleeson's career as senior counsel continued to focus on commercial and constitutional matters. However he also appeared in some high profile criminal cases, including his successful defence before a jury of National Party MP Ian Sinclair in 1980. In the same year he appeared for the appellants in Port Jackson Stevedoring v Salmond & Spraggon, the last case granted leave to appeal to the Privy Council from the High Court. In 1981 he appeared for former Prime Minister William McMahon in Evans v Crichton-Browne, successfully preventing the rhetoric of political debate from being subject to judicial scrutiny under the Commonwealth Electoral Act 1918. Gleeson was President of the New South Wales Bar Association 1984-1985.
He was a methodical counsel, who prepared his cases and even his cross examinations in minute detail. He was nicknamed "the smiler" because of the sternness of his mien. Retired Justice of Appeal Roderick Meagher said jokingly of Gleeson: "He has written nothing outside his professional work. He takes no interest in either music or art. He does, however, like flowers. He stares at them to make them wilt.
Gleeson was appointed as Chief Justice of the Supreme Court of New South Wales in 1988, the first barrister to be directly elevated to the Chief Justiceship since Frederick Jordan in 1934. During his decade as Chief Justice of New South Wales, the court system dealt with considerable change including fast growing demand, cost constraints and delays. He sought to delineate appropriate boundaries for the political debate surrounding litigation, and was adamant that the proper administration of justice was a part of civilised government and not a free market privilege.
The tradition of the Chief Justice frequently appearing in the Court of Criminal Appeal was continued under Gleeson's tenure. In this role, he appeared as a judge in R v Birks, where it was found a trial counsel's proved incompetence was a ground of appeal, and Attorney-General (NSW) v Milat, where an indigent accused was found to be entitled to legal representation as a basic requirement of fairness in a serious legal trial.
Gleeson also frequently presided in the Court of Appeal, a forum more suited to his expertise in administrative, commercial, and constitutional law. In 1992, he presided over Greiner v Independent Commission Against Corruption, which exonerated Nick Greiner from charges of corruption, although Greiner was forced to resign as Premier months earlier by independents who controlled the balance of power in the New South Wales Legislative Assembly. Other notable cases include Ballina Shire Council v Ringland, where he endorsed the constitutionally implied right to freedom of political communication and concluded that councillors could not sue for defamation on statements about their performance, and Egan v Willis where the New South Wales Legislative Council was found to be empowered to compel the treasurer Michael Egan (then a member of the Legislative Council) to produce documents and to suspend him for non-compliance. In Egan v Chadwick, this power was found to be not limited by legal professional privilege.
In May 1998, Gleeson was appointed Chief Justice of the High Court of Australia, replacing Sir Gerard Brennan. He was the first Chief Justice of a state supreme court to be appointed Chief Justice of the High Court since Samuel Griffith, whose own state Chief Justiceship preceded the formation of the High Court. He is also the first Chief Justice not to have been made a knight. During his tenure as Chief Justice, Gleeson has actively maintained the importance of judicial independence in the face of increasing executive government power and public anger with court decisions. He has also spoken out against the use of torture, forced confessions and detention without trial.
His tenure as Chief Justice has also been characterised by a large number of joint judgments, and a relatively frequent number of judgments that clearly and plainly provide the Court's ratio decidendi.
In accordance with the Australian Constitution he retired from the High Court on 29 August 2008, the day before this 70th birthday. The occasion was marked by a ceremonial sitting of the High Court in Canberra. On 30 July 2008 it was announced that Federal Court justice Robert French would succeed Gleeson as Chief Justice.
Gleeson was the Lieutenant Governor of New South Wales 1989 - 1998.
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