His name is Kevin Trudeau. He's been running infomercials for over 15 years, and is the reason why now every infomercial must have one of those "The following is a paid advertisment" warnings first. He started several different programs, such as his Memory program, and more recently he claims to know a bunch of "natural cures" that heal your body without needing drugs or surgery. Oh, and he was convicted of some credit card fraud in 1991.
Personally, I think he blends some truth in with a lot of good fiction and story telling. There may be some good "points" you can pick out, but overall, I wouldn't believe everything he says. For example, he claimed that although he looks like he's in his early forties, he's actually seventy years old, and he only looks that good because he knows all of these health secrets. But his actual age is really around 43! When he was convicted, back in 1991, he was 28 years old, making him ~43 now. What a liar! He also claims that he's been to Area 51, and has seen alien technology and dead alien bodies, and that in the future he's going to write a book about that stuff. Believe what you will about him.