Apparently, he is the man who actually coined the phrase (and trademarked) The Primal Diet. However, after viewing his atrocious website (is it 1995 again?) and leafing through his extremely limited material on the subject, I gathered that he is an advocate for the consumption of raw-foods, including completely raw meats and dairy. I'm not saying it's unhealthy to eat these things completely raw, but God knows I'm not gonna eat that. I like my meat cooked!
I think I'll be sticking with Mark ; )
If you are interested, however, here is an interview with the guy in 1999: Interview with Aajonus Vonderplanitz - presented by Dr. Stanley Bass