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He wrote his first product (Viaweb) in lisp and sold it to Yahoo!. (If a name has an exclamation and it's the last word in a sentence, do I follow it with a period like normal to avoid seeming overly enthusiastic?)

He wrote two books on Common Lisp and has his own Lisp reading list: http://www.paulgraham.com/booklinks.html. There's also, one level higher, a set of lisp links: http://www.paulgraham.com/lisplinks.html

Yes, "!.". I still remember a math problem when I was a kid, in which a sentence ended with "4!"...

Yes. I actually found out HN due to his lisp books, so for me is Paul Graham? The "On Lisp" Paul Graham? haha.

Yes