You can do a search on this very site. Once you get past the fanboy material, you will see that there is very little there there. You will learn that the decades-ago contest that put his name on the map was, and I will be generous here, questionable. And, subsequently, on the occasion he managed outside money he managed to lose most of it while simultaneously enriching himself in his own account. You might want to give that some thought. The NFA certainly did. Their findings and conclusions:
There is no question that Mr. Williams's personal trading accounts had a material effect upon his composite trading performance. The record reflects that for the first quarter of 1987, Mr. Williams's composite performance showed a loss of $6,122,281, while at the same time Mr. Williams's personal accounts experienced a gain of $902,599. The Panel finds that the fact Mr. Williams was making significant gains while managed customer accounts were suffering considerable losses would be a material fact which a potential customer would need to know in order to make a fully reasoned decision.
This was at a time when there were timestamp lags and he had a special relationship with his broker. Are the dots connecting yet?