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Roger Jennings is a principal of OakLeaf Systems, an Oakland, California consulting firm that specializes in the design and implementation of client/server database systems for Fortune 500 companies. He brings over 25 years of computer programming experience to his best-selling Sams titles, including Database Developers Guide with Visual Basic 3, Database Developers Guide with Visual Basic 4, Access 1.1 Developers Guide, Access 2 Developers Guide, and the Roger Jennings Database Workshop books, for which he is the series editor. In addition to writing books, Roger is a Contributing Editor and the writer of "Database Design" columns and feature articles on Visual Basic, Access, and client/server computing for Fawcette Technical Publications Visual Basic Programmers Journal.