Interesting article on multi-yield crops

I just signed up for this guy's mailing list, and found his first article on crops with more than one yield quite interesting. He mentions a few crops I haven't heard of. Nor did I know that you could eat sweet potato greens.

I ordered a few of his perennial seeds, will give it a go. If I lived in Indiana, I'd be making a visit. But that's all I know about the author. Has anyone else run into him, online or in person?