John Walkenbach is one of the country's leading authorities on spreadsheet software. He holds a Ph.D. from the Univerity of Montana and has worked as an instructor, programmer, and market research manager. He finally found a job he's good at: principal of JWalk and Associates Inc., a one-person San Diego-based consulting firm that specializes in spreadsheet application development. John is also a shareware developer, and his most popular product is the award-winning Power Utility Pak add-in for Excel -- which is used by thousands of people throughout the world. John started writing about spreadsheets in 1984, and he has since written more than 250 srticles and reviews for publications such as PC World, InfoWorld, Windows magazine, and PC/Computing. In addition he's the author of a dozen other spreadsheet books, including Excel 2000 Power Programming Techniques, Excel Programming For Dummies and Excel 2000 For Windows For Dummies Quick Reference (all from IDG Books Worldwide). In his spare time John enjoys digital photography and composing and playing music in a variety of styles. John also maintains "The Spreadsheet Page" on the Web. Pay him a visit at http://www.j-walk.com.