Bill Jelen, Excel MVP and the host of MrExcel.com, has been using spreadsheets since 1985, and he launched the MrExcel.com website in 1998. Bill was a regular guest on Call for Help with Leo Laporte and has produced more than 1,900 episodes of his daily video podcast, Learn Excel from MrExcel. He is the author of 44 books about Microsoft Excel and writes the monthly Excel column for Strategic Finance magazine. Before founding MrExcel. com, Bill Jelen spent 12 years in the trenches—working as a financial analyst for finance, marketing, accounting, and operations departments of a $500 million public company. He lives in Merritt Island, Florida, with his wife, Mary Ellen.   Tracy Syrstad is a Microsoft Excel developer and author of eight Excel books. She has been helping people with Microsoft Office issues since 1997, when she discovered free online forums where anyone could ask and answer questions. Tracy found out she enjoyed teaching others new skills, and when she began working as a developer, she was able to integrate the fun of teaching with one-on-one online desktop sharing sessions. Tracy lives on acreage in eastern South Dakota with her husband, one dog, two cats, one horse (two, hopefully soon), and a variety of wild foxes, squirrels, and rabbits.