Educators refer to teens like Alex as "twice exceptional."
"I have a large degree of skill in almost every subject of learning," says Alex, who is 16. "But I also have autistic spectrum disorder."
For Alex, this dual identity has meant both opportunity and frustration.
He has skipped two grades so far, and began taking college math courses last year, when he was still 15. But when he was younger, Alex's underdeveloped social skills caused him a lot of grief.
"I was constantly getting into fights and normally losing them," he says.