Sandra Day O'Connor was born in 1930 and raised on a hard-scrabble Arizona cattle ranch, the Lazy B. She finished near the top of her Stanford Law School class — alongside the future Chief Justice Rehnquist (§100) — only to be told by law firms that they did not hire women as lawyers. She built a career in Arizona politics instead, becoming the first woman to serve as majority leader of any state senate, and then a state judge, before Ronald Reagan kept a campaign promise and named her in 1981 the first woman on the Supreme Court of the United States.
For much of her twenty-five years O'Connor was the most powerful member of the Court — the pragmatic center of a closely divided bench, the justice whose vote decided cases on abortion, affirmative action, religion, and the 2000 election. Distrustful of sweeping rules, she decided narrowly and contextually, and that habit made her the swing vote of her era. She co-authored the joint opinion in Planned Parenthood v. Casey preserving the core of Roe under an 'undue burden' standard; she wrote Grutter v. Bollinger upholding affirmative action, predicting it would be unnecessary within twenty-five years; and in Hamdi v. Rumsfeld she warned that 'a state of war is not a blank check' for the president. She retired in 2006 to care for her ailing husband, and died in 2023.
Grutter v. Bollinger
2003 · 5–4Holding · A university may consider race as one factor in a holistic admissions process to achieve the educational benefits of diversity.
Role · O'Connor wrote for the Court, adding that she expected such preferences to be unnecessary within twenty-five years.
The high-water mark of affirmative action, embracing Powell's (§99) Bakke rationale, until the Court ended race-conscious admissions in 2023 — two decades ahead of her timetable.
Read the opinion →Planned Parenthood v. Casey
1992Holding · The 'central holding' of Roe is reaffirmed, but states may regulate abortion so long as they do not impose an 'undue burden.'
Role · O'Connor co-authored the controlling joint opinion with Kennedy (§104) and Souter (§105).
Preserved the constitutional right to abortion for a generation, on grounds of precedent and the Court's legitimacy, until Dobbs (2022, Alito §110).
Read the opinion →Hamdi v. Rumsfeld
2004Holding · A U.S. citizen detained as an enemy combatant is entitled to due process — notice and a meaningful chance to contest the detention. 'A state of war is not a blank check.'
Role · O'Connor wrote the plurality opinion.
A landmark check on executive power in the war on terror, insisting on the courts' role even in wartime.
Read the opinion →Sandra Day O'Connor was the first woman to sit on the Supreme Court of the United States, and for much of her twenty-five years she was also its most powerful member — the pragmatic center of a closely divided Court, the justice whose vote decided cases on abortion, affirmative action, religion, the death penalty, and the 2000 election. Raised on a hard-scrabble Arizona cattle ranch, the Lazy B, and a top Stanford Law graduate who could not get a law firm to hire a woman as anything but a secretary, she built a career in Arizona politics — becoming the first woman to serve as majority leader of any state senate — before Ronald Reagan kept a campaign promise and named her to the Court in 1981. She distrusted sweeping rules, deciding narrowly and contextually, and that habit made her the swing vote of her era: Planned Parenthood v. Casey, which preserved the core of Roe; Grutter v. Bollinger, which upheld affirmative action in her own hand; Hamdi v. Rumsfeld, where she wrote that 'a state of war is not a blank check.' Evan Thomas's First is the definitive biography. Begin there, then read Grutter to watch the center hold.
The Bookshelf
The definitive biography, and a superb one. Thomas, a veteran journalist and biographer with access to O'Connor's papers and to the justice herself, tells the whole arc — the ranch childhood, the barriers of the 1950s, the Arizona political rise, and the twenty-five years at the Court's balancing point — with narrative sweep and shrewd judgment about how she wielded power. He is especially good on her pragmatism and her care for the Court as an institution, and honest about the costs of a jurisprudence built on case-by-case balancing. The essential book. Random House.
The first major biography, by the veteran Court journalist Joan Biskupic — written while O'Connor still sat, and definitive on how the pragmatic Arizonan became the swing vote who decided abortion, affirmative action, and religion for a generation. Ecco.
The political scientist's study of O'Connor's method — the deliberate, accommodationist, case-by-case strategy that made her the Court's median vote and, for years, its most powerful member. The best account of how she actually wielded that power. Rowman & Littlefield.
A concise, readable life for the general reader, tracing the ranch-girl-to-swing-vote arc with a journalist's eye. (Linda Hirshman's Sisters in Law, 2015, tells O'Connor's story intertwined with Ginsburg's.) University of New Mexico Press.
O'Connor's memoir of the Arizona ranch where she grew up, written with her brother — not a book about the Court, but the key to the character who ran it from the center. The Lazy B's world of hard work, self-reliance, and practical problem-solving formed the temperament she brought to the bench: skeptical of abstraction, attentive to consequences, comfortable with judgment calls. Warm and vivid, it explains where the pragmatism came from. Random House. Pair it with her later reflections in The Majesty of the Law (2003).
O'Connor's reflections on the Court, its history, and the rule of law — accessible essays on the institution she helped steer, written in the middle of her decisive final decade. Random House.
The retired justice's affectionate tour of Supreme Court history and lore — the customs, personalities, and turning points of the institution, told with warmth by someone who reshaped it. Random House.
O'Connor's signature opinion, and the fullest expression of her pragmatic method. Upholding the University of Michigan Law School's consideration of race in admissions, she embraced Powell's Bakke diversity rationale and held that narrowly tailored affirmative action served a compelling interest — while famously adding that she expected such preferences would no longer be necessary in twenty-five years. The opinion governed university admissions until the Court rejected it in the Harvard and UNC cases (2023), two decades ahead of her timetable. Read it as the swing justice at the height of her power, deciding the nation's most divisive question in the middle register she preferred.
The extraordinary joint opinion — co-authored with Kennedy (§104) and Souter (§105), and widely understood to bear O'Connor's decisive imprint — that reaffirmed the 'central holding' of Roe v. Wade while replacing its trimester framework with her own 'undue burden' standard. Expected by many to overrule Roe, the three centrist Republicans instead preserved it on grounds of precedent and the Court's legitimacy, in language about not overruling under fire that would be quoted for decades. Read it beside Grutter to see the center at work on the hardest question of all — and beside Dobbs (2022), which finally swept it away.
O'Connor holding the center in the war on terror. Writing for a plurality, she held that even a citizen detained as an 'enemy combatant' is entitled to due process to contest the detention: 'a state of war is not a blank check for the President.' A characteristic O'Connor compromise between security and liberty, and a rebuke to unchecked executive power. Free online.
The Reading Path
A researched route through the literature — in order.
- 1.Thomas, First — for the definitive life of the first woman on the Court
- 2.Grutter v. Bollinger — for her signature opinion and pragmatic method
- 3.Planned Parenthood v. Casey — for the centrist vote that preserved Roe for a generation
- 4.O'Connor, Lazy B — for the ranch origins of the pragmatism
- 5.Biskupic, The Most Influential Justice — for how the swing vote actually ran the Court
Where the Papers Are Kept
O'Connor's papers were placed at the Library of Congress and have been opened to researchers, documenting her twenty-five years at the center of the Court along with her Arizona political career and her later civic work. Because she sat at the decisive point in so many closely divided cases, her files — case histories, memoranda, and correspondence with colleagues across the spectrum — are a rich source for the inner workings of the Rehnquist Court. A major modern judicial archive. Visit →
Ideas for Further Research
- The power of the center. For years O'Connor was, by common reckoning, the most powerful jurist in America — not because she led a bloc but because she stood between them, so that the law often became whatever she would join. Study the swing justice as a structural phenomenon: how a narrowly divided Court concentrates power in a single pragmatic vote, and whether that is a strength (moderation, restraint) or a distortion (unpredictability, personal rule) of the judicial function.
- Narrow by design. O'Connor deliberately decided cases on the facts before her, resisting broad rules and bright lines; critics called the result unpredictable and unprincipled, admirers called it prudent and humble. Compare her contextual, standard-based method with the rule-based originalism of Scalia (§103), and ask which better serves a diverse country, litigants seeking guidance, and the Court's own legitimacy.
- The twenty-five-year clock. In Grutter O'Connor wrote that racial preferences in admissions should be unnecessary within a generation; the Court ended them at year twenty. Set her prediction against the outcome and against Casey's confidence that a settled precedent could hold, and study the risks of a jurisprudence that stakes constitutional rules on forecasts about how the country will change. Seat lineage: Potter Stewart §92 → Sandra Day O'Connor → Samuel Alito §110.