BTW, "The Underground History of Public Education" is available on line.
Fortunately, I was able to talk to him for a few minutes after the seminar. He does great with one on one too. As people walked up, he acknowledged them, signed autographs, and without missing a beat, would continue talking to me, answering my questions.
I ended up buying "The Underground History..." right then and there, if anything because of his marvelous wit, his intelligence and because I agreed with nearly everything he talked about.