David H. Ringstrom is a CPA and owner of Accounting Advisors, Inc., an Atlanta-based spreadsheet and database consulting firm that he started in 1991. David teaches 180 live webinars annually on Microsoft Excel, along with occasionally speaking at conferences. He is the co-author of Idiot's Guides: Introductory Accounting, and has served as the technical editor for over 30 books on accounting software. Some of his hundreds of freelance articles on spreadsheets have been published internationally.