Like Lao-Tzu for all he knew, but my expectation is that he couldn't have maintained an intellectual debate with her for more than 3 minutes. Besides, he didn't bother to evaluated the content of any of the works on his list(else wise he might have eliminated Kant, Hegel, Nietzsche, Chomsky and Skinner. The qualifier here seems to be the word, "Influential."
So, Mr. Seymour seems to have negated his own credibility and that of his list via his selective 'objectivity.'
The criteria was merely influence and nothing more. He made the point that it's not a list of literary masterworks (or else Dickens and Goethe would be there)nor is it a list of the best known books of all time (or else 'Gone with the Wind' would be there) nor is it a list of the books he would ahve wanted to have influenced people (or else Winesburg,Ohio and the work of Lewis Carroll...)
I didn't see "Lime Rock Park -- 35 Years of Racing" by Rich Taylor on the list. Was there a typo?