I tend to be a bit tongue in cheek, but for more background he started in the 1970s, only a few years after stimulants were researched for ADHD treatment in children. He undoubtedly had connections in that area (the Erdós number is a thing, after all), and in the prior 30 years was known for drinking copious amounts of coffee, so better stimulants weren’t exactly a difficult jump to make regardless, but it wasn’t necessarily that he knew he had the condition now known as ADHD, just that they were what worked best for him.
“Just happened to…?” He’s a genius, he likely asked doctors he knew what the effective medication would be, rather than just popping random pills.
I tend to be a bit tongue in cheek, but for more background he started in the 1970s, only a few years after stimulants were researched for ADHD treatment in children. He undoubtedly had connections in that area (the Erdós number is a thing, after all), and in the prior 30 years was known for drinking copious amounts of coffee, so better stimulants weren’t exactly a difficult jump to make regardless, but it wasn’t necessarily that he knew he had the condition now known as ADHD, just that they were what worked best for him.