Benjamin Cardozo decided cases that every American law student still reads, and he wrote them in a prose so clear and so alive that lawyers quote the sentences a century later. He is one of the two or three finest judges the country has produced, and what makes him worth a trial lawyer's study is not just what he decided about duty and cause, but how he thought his way there, and how he made the hardest ideas in tort law sound like plain sense.

Cardozo spent most of his career on the highest court of New York, where he rose to chief judge, and then, in 1932, he was appointed to the United States Supreme Court, taking the seat of Oliver Wendell Holmes. But his enduring influence came from the common-law opinions he wrote in New York, cases about ordinary accidents and injuries that turned out to set the shape of American tort law for the century that followed. He worked, as his contemporaries put it, with rare learning and fabulous industry, and it shows in every line.

His opinion in MacPherson v. Buick is one of them. The old rule was that a manufacturer answered only to the person it sold to, so an injured buyer had no claim against the maker of a defective product he had not bought directly. Cardozo swept that away. He reasoned that when a manufacturer puts a dangerous product into the stream of commerce knowing others will use it, it owes a duty to those users, contract or no contract. It is a foundation of modern product liability, and he built it not with a thunderclap but with careful, step-by-step reasoning that made the new rule feel like it had always been there.

His most famous opinion, Palsgraf v. Long Island Railroad, is the one every lawyer argues about. A railroad guard, helping a man onto a moving train, dislodged a package that turned out to hold fireworks, and the explosion, the story went, toppled scales far down the platform onto a waiting passenger. Was the railroad liable to her. Cardozo said no, and in doing so he framed the question that still governs: duty runs only to those within the range of foreseeable harm, and a defendant is not liable to a plaintiff whose injury was not a reasonably foreseeable consequence of the careless act. Lawyers have fought over Palsgraf for a hundred years because Cardozo put the whole problem of duty and foreseeability into a single vivid scene.

And that is the second lesson, the one about craft. Cardozo could have written these opinions in the dense, clause-choked style of his era. He did the opposite. He wrote in short, clear, memorable sentences, he used the concrete facts to carry the principle, and he trusted a plain image to do the work of a paragraph of jargon. That is why his opinions are quoted and the others forgotten. He understood something a trial lawyer needs to understand: the clearest statement of an idea is also the most persuasive, because a reader who understands you easily is a reader already halfway to agreeing.

For the trial lawyer, Cardozo is two gifts at once. He is the source of the doctrines you argue every day, duty, foreseeability, the scope of a defendant's responsibility, and it helps to know they came from a mind wrestling with real accidents, not from an abstraction. And he is a model of how to write and think: reduce the tangle to the clean question, anchor it in the concrete facts, and say it so plainly that the principle seems obvious once stated. That is not a lesser skill than deep learning. In front of a jury, it is the whole skill.

Cardozo died in 1938, and Learned Hand, no small judge himself, eulogized him for his learning and his industry. But the monument is the opinions, still assigned, still argued, still clear. He proved that the deepest thinking and the plainest writing are not opposites but partners, and that a lawyer who masters both can put a principle into a sentence that outlives him by a hundred years. Learn the doctrines. Then learn the sentences. Both came from the same man.

Benjamin N. Cardozo (1870 to 1938), who served on the New York Court of Appeals, including as its Chief Judge, and then as a Justice of the United States Supreme Court from 1932 until his death, and who is regarded as one of the greatest common-law judges and legal stylists in American history. His opinions in MacPherson v. Buick Motor Co. (1916) and Palsgraf v. Long Island Railroad Co. (1928) remain foundations of the modern law of duty, product liability, and proximate cause. Considered here for the craft of judging and of legal writing. This is general information, not legal advice.