Beverley Marian McLachlin was born Beverley Gietz on September 7, 1943, in Pincher Creek, Alberta, the eldest of five children in a rural ranching and farming family of German descent. Her parents, Ernest Gietz and Eleanora Kruschell, were fundamentalist Christians associated with the Pentecostal Church, and the household was modest. She later described a childhood shaped by hard work, books, and the isolation of the foothills, an upbringing that did not point obviously toward the highest judicial office in Canada. She studied at the University of Alberta, earning a bachelor’s degree in philosophy, then both a master’s degree in philosophy and a law degree in 1968. The combination of analytic philosophy and professional legal training stayed visible in her later writing: clear premises, careful distinctions, and an insistence that doctrine answer to practical consequences.
She was called to the Alberta bar in 1969 and began practice with an Edmonton firm. In 1971 she moved to British Columbia, was called to that province’s bar, and worked briefly in Fort St. John before joining Bull, Housser and Tupper in Vancouver. From 1974 to 1981 she also taught at the University of British Columbia Faculty of Law, becoming a tenured associate professor. Colleagues later recalled a teacher who treated private law and public law with the same demand for precision. In April 1981 she was appointed to the County Court of Vancouver; within months she was elevated to the Supreme Court of British Columbia. In December 1985 she joined the British Columbia Court of Appeal, and in September 1988 she became chief justice of the Supreme Court of British Columbia. Seven months later, in April 1989, Prime Minister Brian Mulroney appointed her to the Supreme Court of Canada. She was forty-five.
On January 7, 2000, Prime Minister Jean Chrétien named her the seventeenth chief justice of Canada. She was the first woman to hold the office in Canada and the first woman to lead the high court of a Commonwealth country. She remained chief justice until December 15, 2017, retiring nine months before the mandatory age of seventy-five and becoming the longest-serving chief justice in Canadian history. As chief justice she also chaired the Canadian Judicial Council and served in roles connected to the Order of Canada and the National Judicial Institute. She was fluent in English and French, an administrative necessity on a bilingual court, and was widely credited with keeping a collegial bench through years of contentious Charter litigation.
Her personal life ran alongside that ascent. She married Roderick McLachlin in 1967; they had a son, Angus, born in 1976. Roderick died in 1988. In 1992 she married Frank McArdle. The early loss of her first husband and the demands of rapid promotion were rarely part of her public persona, which remained formal, measured, and reluctant to personalize institutional disputes.
On the Court she was difficult to place on a simple left-right scale. Early commentary cast her as a civil libertarian, especially on expression. In RJR-MacDonald she concluded that a near-total federal ban on tobacco advertising went further than the Charter allowed. In R. v. Sharpe she defended a limited space for artistic and written expression even in the fraught setting of child pornography law, while accepting that Parliament could criminalize material that posed a reasoned risk of harm. Those judgments sat beside more institutional rulings. In Babcock she accepted the Crown’s ability to withhold documents on the basis of Cabinet confidence. In Starson v. Swayze she supported the authority of mental-health review boards to authorize treatment against a patient’s wishes in defined circumstances. The pattern was less ideological consistency than a preference for structured justification: state power had to be tied to evidence and to a proportionate objective.
Several decisions of the McLachlin Court reshaped Canadian public law. In Chaoulli, she and Justice Deschamps found that Quebec’s ban on private health insurance, in the face of long waits for care, violated security of the person. In Canada v. PHS Community Services Society, the Court held that the federal minister’s refusal to extend an exemption for Vancouver’s Insite supervised injection site unjustifiably endangered life and security. In Canada v. Bedford, McLachlin wrote for a unanimous Court striking down Criminal Code provisions on bawdy houses, living on the avails, and communicating for the purpose of prostitution, on the ground that the laws increased the risks faced by sex workers without a constitutionally adequate justification. In Carter v. Canada she wrote the reasons holding that the absolute prohibition on physician-assisted dying forced some people to end their lives earlier than they otherwise would, contrary to section 7. Her earlier dissent in Rodriguez, which had upheld the ban, supplied part of the intellectual background for that later unanimous reversal.
Indigenous law was another center of the era. The Court developed the duty to consult and accommodate when Crown conduct might affect asserted Aboriginal rights or title. In 2014 McLachlin wrote the unanimous judgment in Tsilhqot’in Nation v. British Columbia, the first Supreme Court decision to declare Aboriginal title over a specific territory, roughly 1,700 square kilometres, and to set out the incidents of that title and the test for justifying infringement. Federalism cases also marked the period. Reference re Securities Act rejected a proposed national securities regulator as beyond Parliament’s trade and commerce power. Reference re Senate Reform held that significant changes to the Senate required constitutional amendment procedures, not ordinary statute.
Critics argued that some of these rulings pressed section 7 and the Court’s remedial powers into policy domains better left to legislatures. Supporters answered that the Charter requires courts to test laws against evidence of harm, especially where vulnerable groups bear the cost of legislative design. McLachlin’s own extra-judicial writing tended to emphasize the legitimacy of judicial review under a constitutional text that citizens had adopted, and the corresponding duty of judges to explain themselves in reasons that non-lawyers could follow. She was praised for lucid prose and for opinions that stated the holding early and then justified it.
After retirement she accepted appointment as a non-permanent judge of the Hong Kong Court of Final Appeal, beginning a three-year term in 2018, a role that drew both interest and controversy given political developments in the territory. She also turned to fiction, publishing legal novels that drew on the institutional world she knew without claiming to be memoirs of the Court. Honours accumulated, including appointment as a Companion of the Order of Canada and membership in the Privy Council, along with numerous honorary degrees.
Her career is often summarized by two firsts: first woman chief justice, and longest-serving chief justice. Those labels are accurate and incomplete. She moved from a small-town Alberta upbringing through provincial trial and appellate courts to the national apex in less than a decade of judging, then led the Supreme Court for nearly eighteen years through the mature phase of Charter adjudication. The body of law associated with her tenure includes freer commercial expression, tighter scrutiny of criminal laws that endanger the people they regulate, the first declaration of Aboriginal title, and repeated reminders that structural constitutional change cannot be done by ordinary statute. Whether that record is read as a necessary working-out of the 1982 Constitution or as an expansion of judicial power, it is the record against which later Canadian courts still measure themselves.