JAY GREENSPAN is a New York—based writer, editor, and technical consultant. He is author of MySQL Weekend Crash Course® and runs Trans-City Productions, Inc., a firm that provides editorial services to high-tech companies.

DAVID WALL is a freelance technical consultant, lecturer, and writer operating through his consultancy David Wall Enterprises. He specializes in Linux/Apache/MySQL/PHP (LAMP) servers and in Voice over IP technologies from IBM and Cisco Systems.