Donald T. was not like other 5-year-old boys. Leo Kanner knew that the moment he read the 33-page letter from Donaldʼs father that described the boy in obsessive detail as “happiest when he was alone… drawing into a shell and living within himself… oblivious to everything around him.”

Stylianos Antonarakis still vividly remembers the thorny statistical problem that had vexed him for several months in 1982. Antonarakis, then a postdoctoral fellow at Johns Hopkins University, had turned to his colleagues at Hopkins, but none of them had been able to solve the problem.