The justices most often ranked among the greatest Supreme Court justices of all time are the ones whose opinions still decide cases generations later: John Marshall, Oliver Wendell Holmes Jr., Louis Brandeis, Earl Warren, Robert Jackson, Thurgood Marshall, Ruth Bader Ginsburg, and Antonin Scalia. Each one either built a branch of constitutional doctrine from scratch or redirected it so decisively that lawyers and judges today still work inside the frameworks they left behind. What follows is what each of them actually did, and why that work has lasted.
John Marshall
Before John Marshall took the oath as Chief Justice in 1801, the Supreme Court was something of an afterthought. It had no permanent home, struggled to attract top legal talent, and lacked any clear mechanism for checking the other branches. Marshall served 34 years and turned the Court into a coequal branch of government.
His most consequential move came in Marbury v. Madison in 1803, where the Court declared for the first time that it could strike down an act of Congress as unconstitutional. Marshall wrote that it is “emphatically the province and duty of the judicial department to say what the law is,” reasoning that if the Constitution is the supreme law, any legislation that contradicts it must fall.1Congress.gov. ArtIII.S1.3 Marbury v. Madison and Judicial Review The opinion was politically shrewd as well. Marshall gave the Jefferson administration the short-term result it wanted by denying Marbury his commission, while claiming an enormous long-term power for the judiciary that no one could undo without rejecting the ruling’s logic.2Justia. Marbury v. Madison
Sixteen years later, Marshall expanded federal authority again in McCulloch v. Maryland. Maryland had tried to tax a branch of the national bank out of existence. Marshall held that Congress possessed implied powers beyond those explicitly listed in the Constitution, so long as the chosen means were legitimate and adapted to a permitted end. He struck down the tax, writing that “the power to tax involves the power to destroy,” and that no state could wield that kind of leverage over the federal government.3National Archives. McCulloch v. Maryland (1819) Between these two decisions, Marshall set the two pillars that still support the modern Court: the authority to review legislation and a broad reading of what Congress may do.
Oliver Wendell Holmes Jr.
If Marshall built the Court’s power, Holmes taught it restraint. The early twentieth century was dominated by the so-called Lochner era, when the Court regularly struck down labor regulations as violations of an implied “liberty of contract.” Holmes dissented from the 1905 Lochner v. New York decision in what became one of the most quoted opinions in American legal history. He argued that “a constitution is not intended to embody a particular economic theory,” and that judges had no business substituting their own preferences for the will of a legislature acting within its powers.4Justia. Lochner v. New York That dissent eventually became the majority view and still stands as the definitive argument against judges acting as unelected policymakers.
Holmes also gave free-speech law its earliest framework. Writing for a unanimous Court in Schenck v. United States in 1919, he introduced the “clear and present danger” test, holding that speech could be restricted only when it created an immediate risk of a serious harm Congress had authority to prevent.5Justia. Schenck v. United States The standard has been refined and replaced over the decades, but the core idea that free speech has limits tied to real-world consequences remains central to First Amendment analysis.
Louis Brandeis
Louis Brandeis brought a different kind of innovation. Before joining the Court, he pioneered the use of sociological and economic data in legal arguments. In Muller v. Oregon in 1908, he filed what became known as the “Brandeis Brief,” a document packed with social science evidence rather than just legal citations. The approach changed how lawyers argued constitutional cases and signaled that courts could not ignore the world outside the courtroom.
On the bench, Brandeis wrote what many consider the most prescient dissent in Court history. In Olmstead v. United States in 1928, the majority ruled that wiretapping did not violate the Fourth Amendment because no one had physically entered the defendant’s home. Brandeis disagreed. He argued that the framers “conferred, as against the Government, the right to be let alone—the most comprehensive of rights, and the right most valued by civilized men.” Constitutional protections, he insisted, had to adapt to new technologies, and wiretaps were far more invasive than the general warrants the founders had feared.6Justia. Olmstead v. United States Nearly four decades later, the Court adopted his reasoning and overruled Olmstead entirely. In an age of digital surveillance, his dissent reads less like a minority opinion and more like prophecy.
Earl Warren
No Chief Justice reshaped daily life in America more dramatically than Earl Warren. The former California governor arrived at the Court in 1953 with a politician’s instinct for consensus and a deep conviction that the Constitution had to mean something concrete for ordinary people. Over the next sixteen years, his Court rewrote the rules on race, criminal justice, and the relationship between individuals and the state.
Brown v. Board of Education
Warren’s first great achievement was Brown v. Board of Education in 1954. The case challenged racial segregation in public schools under the “separate but equal” doctrine that had stood since 1896. Warren worked behind the scenes to secure a unanimous decision, understanding that anything less than 9-0 would give segregationists room to resist. The opinion declared that separating children by race “generates a feeling of inferiority as to their status in the community that may affect their hearts and minds in a way unlikely ever to be undone,” and held that separate educational facilities are inherently unequal.7National Archives. Brown v. Board of Education (1954) The ruling did not end segregation overnight, but it destroyed its legal foundation and launched the modern civil rights movement.
The Criminal Procedure Revolution
Warren’s Court then turned to criminal justice, applying Bill of Rights protections against the states through the Fourteenth Amendment at a pace that stunned the legal establishment. In Mapp v. Ohio in 1961, the Court ruled that evidence obtained through unconstitutional searches could not be used in state criminal trials, holding that the Fourth Amendment’s right to privacy was “enforceable against the States through the Due Process Clause of the Fourteenth” Amendment.8Justia. Mapp v. Ohio Two years later, Gideon v. Wainwright established that anyone charged with a felony who cannot afford a lawyer is entitled to one at the state’s expense. Justice Black, writing for a unanimous Court, stated that “reason and reflection require us to recognize that in our adversary system of criminal justice, any person haled into court, who is too poor to hire a lawyer, cannot be assured a fair trial unless counsel is provided for him.”9Justia. Gideon v. Wainwright
The most famous criminal procedure case came in 1966 with Miranda v. Arizona. Warren himself wrote the opinion requiring police to inform suspects of their right to remain silent and their right to an attorney before custodial questioning begins. The Court found that the pressurized atmosphere of police interrogation “contains inherently compelling pressures which work to undermine the individual’s will to resist.”10Justia. Miranda v. Arizona The Miranda warning is now so deeply embedded in American culture that most people can recite it from memory.
Robert Jackson
Robert Jackson earns his place for one opinion. His concurrence in Youngstown Sheet & Tube Co. v. Sawyer in 1952 laid out a three-zone framework for evaluating presidential authority that every administration, court, and legal scholar has relied on since. When the president acts with congressional approval, Jackson wrote, executive power is at its peak. When Congress is silent, the president operates in a “zone of twilight” where authority is uncertain. And when the president acts against Congress’s expressed will, executive power hits its lowest point and “must be scrutinized with caution.” That framework has been cited in virtually every major separation-of-powers dispute for over seventy years, from Watergate-era litigation to twenty-first-century fights over executive orders.
Jackson also brought a moral authority to the bench that few justices can match. Before his appointment, he served as the chief American prosecutor at the Nuremberg trials, and on the Court he was a gifted prose stylist whose opinions are still read for their clarity and wit, not just their legal reasoning.
Thurgood Marshall
Some justices earn their place through what they accomplished before they ever put on the robe. Thurgood Marshall spent decades as the lead attorney for the NAACP Legal Defense Fund, personally arguing Brown v. Board of Education before the Court in 1952 and 1953. He told the justices during oral argument that the only way to rule against desegregation was “to find that for some reason Negroes are inferior to all other human beings,” and that “nobody will stand in the Court and urge that.” Beyond Brown, he successfully challenged whites-only primary elections, won rulings that made racially restrictive housing covenants unenforceable, and integrated state universities across the South. At one point, the Legal Defense Fund under his leadership managed roughly 450 simultaneous cases.
As the first Black justice on the Supreme Court, Marshall spent 24 years ensuring that the lived experiences of people facing systemic discrimination were part of the Court’s deliberations. He became the most persistent critic of capital punishment in the Court’s history, consistently arguing that the death penalty violated the Eighth Amendment’s prohibition on cruel and unusual punishment.
Ruth Bader Ginsburg
Ginsburg took a page from Marshall’s litigation playbook. As director of the ACLU Women’s Rights Project in the 1970s, she pursued a careful, incremental strategy of bringing cases that exposed the irrationality of gender-based legal classifications. She often chose male plaintiffs who had been harmed by laws favoring women, understanding that this made the abstract principle of equal treatment more vivid to a bench of mostly male judges.
Her most significant opinion as a justice came in United States v. Virginia in 1996, where she wrote for the majority in striking down the Virginia Military Institute’s male-only admissions policy. The decision held that any government classification based on sex requires an “exceedingly persuasive justification,” and that the justification cannot rest on “overbroad generalizations about the different talents, capacities and preferences of men and women.”11Justia. United States v. Virginia That standard made sex-based discrimination substantially harder to defend in court and opened doors in education, employment, and military service that had been closed for generations.
Antonin Scalia
Antonin Scalia changed how an entire generation of lawyers reads legal texts. His philosophy of originalism holds that the Constitution means what its words meant to the public when they were ratified. Judges who update the Constitution’s meaning to fit modern sensibilities, Scalia argued, are simply legislating from the bench.
His most important majority opinion put that philosophy into action. In District of Columbia v. Heller in 2008, Scalia conducted an exhaustive analysis of founding-era sources to conclude that the Second Amendment protects an individual right to keep and bear arms for lawful purposes like self-defense, independent of service in a militia.12Congress.gov. Amdt2.4 Heller and Individual Right to Firearms The 5-4 decision reshaped gun regulation across the country and stands as the most thorough application of originalist methodology in a majority opinion.13Legal Information Institute. District of Columbia v. Heller
Scalia was equally influential in dissent. His opinions were written to be read, not skimmed, and they had a rhetorical edge legal academia had not seen from a sitting justice. He believed the Court should interpret statutes based on their plain text rather than searching for what Congress secretly intended, and his advocacy for that approach made textualism the dominant method of statutory interpretation in federal courts. Even justices who disagreed with his conclusions adopted much of his methodology.
Why the Job Produces Figures Like These
The process that produces consequential justices is simple on paper. Under Article II of the Constitution, the president nominates candidates, and the Senate confirms or rejects them.14Constitution Annotated. Article II Section 2 Clause 2 Article III provides that justices “hold their Offices during good Behaviour,” which in practice means they serve for life unless they resign, retire, or are impeached. A justice appointed at 50 can shape American law for three or four decades, long after the president who nominated them has left office.
The Court also chooses nearly all of its own cases through the certiorari process, generally selecting disputes that involve conflicts among lower courts or raise questions of national constitutional significance. A justice who writes the opinion in one of those cases can establish a rule that binds every court in the country. That is why the opinions above carry so much weight. They were not advisory memos. They were binding law that reshaped how 330 million people live.