I met him today at Chatsworth, purchased the book, and he signed it. I asked him if he was related to Clyde Birdsall who was the head ranger at Atsion when I first started exploring the pines in 1973, and he informed me he was not. I was not the first to ask him that question. Using the info that I knew and what Largo has mentioned I explained who he was.
It was really nice talking with him, and I hope to look the book over soon, but I have to pry it out of Jessica's hands. The photo's look really nice.
Guy