Tell me about Andy Beal

[KSOT]

I don't really know much about the guy, other than what I could piece together from various google finds, none of which were very detailed.

I know he used to come to the Bellagio and demand that the best pros play him in 100,000/200,000 limit HE heads up. As I understood it, he ended up losing more than he won, but then when he issued an open challenge to the pros for them to come to Texas and play him, they refused. Why would they do that? I read that Doyle wrote a letter accusing his challenge of being biased somehow, but I couldn't find it. What was it about? Did the pros have some reason to be afraid?

I saw a number of posters talking about how awesome he was at Limit HE, but what did he ever do to prove that?

Any and all Andy Beal details are welcome. I'm very curious.