He was on Leno about a year ago and he pulled his hair back to prove to people he had it and it was a good hairline! You could tell it was transplanted, though. I believe he got his hairline transplanted thick and didn't think about the hair behind it, it thinned out eventually, and he's using all the hair on the back, sides, and front to "swoop" it to the middle to cover the baldness...IMO.
I also heard the same thing Robert heard, he has became known to the public for his brilliance, money, and hair!