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Rasmus Lerdorf started the PHP Project back in 1995 and has been actively involved in PHP development ever since. Also involved in a number of other open source projects, Rasmus is a longtime Apache contributor and foundation member. He is the author of the first edition of the PHP Pocket Reference and the coauthor of the first edition of Programming PHP (both from O'Reilly).
Kevin Tatroe has been a Macintosh and Unix programmer for 10 years. He is an experienced PHP developer, knowledgeable in the changes coming with PHP 5. He is also coauthor of the first edition of Programming PHP.