John Walkenbach (Tucson, AZ) principal of J-Walk and Associates, Inc. is a leading authority on spreadsheet software and creator of the award-winning Power Utility Pak. He has written more than 30 books and 300 articles and reviews for publications including PC World, InfoWorld, and Windows. He also maintains the popular Spreadsheet Page at
www.j-walk.com/ss and promotes all his books at that site.