He called his approach to judging pragmatic. His critics called it lawless. “I pay very little attention to legal rules, statutes, constitutional provisions,” Judge Posner said. “A case is just a dispute. The first thing you do is ask yourself — forget about the law — what is a sensible resolution of this dispute?”

The next thing, he said, was to see if a recent Supreme Court precedent or some other legal obstacle stood in the way of ruling in favor of that sensible resolution. “And the answer is that’s actually rarely the case,” he said. “When you have a Supreme Court case or something similar, they’re often extremely easy to get around.”

I asked him about his critics, and he said they fell into two camps.

Some, he said, simply have a different view of the proper role of the judge. “There is a very strong formalist tradition in the law,” he said, summarizing it as: “Judges are simply applying rules, and the rules come from somewhere else, like the Constitution, and the Constitution is sacred. And statutes, unless they’re unconstitutional, are sacred also.”

“A lot of the people who say that are sincere,” he said. “That’s their conception of law. That’s fine.”

He said he had less sympathy for the second camp. “There are others who are just, you know, reactionary beasts,” he said. “They’re reactionary beasts because they want to manipulate the statutes and the Constitution in their own way.”

The immediate reason for his retirement was less abstract, he said. He had become concerned with the plight of litigants who represented themselves in civil cases, often filing handwritten appeals. Their grievances were real, he said, but the legal system was treating them impatiently, dismissing their cases over technical matters.

“These were almost always people of poor education and often of quite low level of intelligence,” he said. “I gradually began to realize that this wasn’t right, what we were doing.”