Evangelos Petroutsos is a computer engineer who has worked for the California Institute of Technology and MCI. He writes articles, teaches programming courses, and wrote the best-selling Mastering Visual Basic .NET, Mastering VB 6, and VB 6 Developer's Handbook, from Sybex. Richard Mansfield has written hundreds of magazine articles and 32 computer books. Richard's books have sold more than 500,000 copies worldwide, and have been translated into 11 languages.