How long are the videos? Sell us a little bit on why we should watch?
He's the author of Gaia's Garden
which is kind of controversial. Some people swear by it and some people hate it. The swear by it is kind of obvious; it was pretty revolutionary when it first came out and introduced the Gaia concept as well as permaculture, guilds, sustainability to a lot of people who had never heard of them.
But here's part of one review from Amazon
While Hemenway's ideas are intriguing, creating guilds specific to an area involves extensive research, which involves either observing plant communities in the wild or using books or university contacts. In addition, the author doesn't sufficiently explain how to incorporate the many sun-loving vegetables and flowers into guilds, which are often shade-oriented. Recommended only for botanical and academic libraries.
Here's a thread where someone pointed out a bunch of annoyances with Gaias Garden:
So, I'm just saying sell us a little!