

Video: The authors reveal how they tracked down Donald and discuss the significance of his long, happy life.

According to family lore, Polgar put on his show and then, after taking his final bows, approached his hosts with a proposal: that they let him bring Donald with him on the road, as part of his act.

Donald’s parents were taken aback. “My mother,” recalls Donald’s brother, Oliver, “was not at all interested.” For one, things were finally going well for Donald, after a difficult start in life. “She explained to [Polgar] that he was in school, he had to keep going to classes,” Oliver says. He couldn’t simply drop everything for a run at show business, especially not when he had college in his sights.

But there was also, whether they spoke this aloud to their guest or not, the sheer indignity of what Polgar was proposing. Donald’s being odd, his parents could not undo; his being made an oddity of, they could, and would, prevent. The offer was politely but firmly declined.

What the all-knowing mentalist didn’t know, however, was that Donald, the boy who missed the chance to share his limelight, already owned a place in history. His unusual gifts and deficits had been noted outside Mississippi, and an account of them had been published—one that was destined to be translated and reprinted all over the world, making his name far better-known, in time, than Polgar’s.

His first name, anyway.

Donald was the first child ever diagnosed with autism. Identified in the annals of autism as “Case 1 … Donald T,” he is the initial subject described in a 1943 medical article that announced the discovery of a condition unlike “anything reported so far,” the complex neurological ailment now most often called an autism spectrum disorder, or ASD. At the time, the condition was considered exceedingly rare, limited to Donald and 10 other children—Cases 2 through 11—also cited in that first article.

That was 67 years ago. Today, physicians, parents, and politicians regularly speak of an “epidemic” of autism. The rate of ASDs, which come in a range of forms and widely varying degrees of severity—hence spectrum—has been accelerating dramatically since the early 1990s, and some form of ASD is now estimated to affect one in every 110 American children. And nobody knows why.

There have always been theories about the cause of autism—many theories. In the earliest days, it was an article of faith among psychiatrists that autism was brought on by bad mothers, whose chilly behavior toward their children led the youngsters to withdraw into a safe but private world. In time, autism was recognized to have a biological basis. But this understanding, rather than producing clarity, instead unleashed a contentious debate about the exact mechanisms at work. Differing factions argue that the gluten in food causes autism; that the mercury used as a preservative in some vaccines can trigger autistic symptoms; and that the particular measles-mumps-rubella vaccine is to blame. Other schools of thought have portrayed autism as essentially an autoimmune response, or the result of a nutritional deficiency. The mainstream consensus today—that autism is a neurological condition probably resulting from one or more genetic abnormalities in combination with an environmental trigger—offers little more in the way of explanation: the number of genes and triggers that could be involved is so large that a definitive cause, much less a cure, is unlikely to be determined anytime soon. Even the notion that autism cases are on the rise is disputed to a degree, with some believing that the escalating diagnoses largely result from a greater awareness of what autism looks like.