Paul DuBois is the leading author of books on MySQL topics. His book, entitled MySQL, is widely considered the definitive work on MySQL. He is a developer for MySQL AB, where he edits and maintains the official English-language documentation for MySQL. Stefan Hinz is leads the MySQL documentation team, is a MySQL trainer and consultant, and the German translator of the MySQL Reference Manual. He is also the translator of Paul's MySQL Cookbook (O'Reilly and Associates) and translator and author of MySQL-related German books. Stefan passed the MySQL Certification exam before he joined MySQL AB.