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Stoyan Stefanov is a Yahoo! web developer, Zend Certified Engineer, and an author, contributor, and tech reviewer of various O'Reilly books. He speaks regularly about web development topics at conferences and on his blog at www.phpied.com. Stoyan is the creator of the smush.it image optimization tool and architect of Yahoo's performance optimization tool YSlow 2.0.
If you're a beginner you don't need a book, you go online and read on some basics.
If you're a pro you do need a book and this is the book you need.