Bob Umlas worked for a major tax and accounting firm, using Microsoft Excel® 8 hours a day, writing custom applications for staff and clients from 1998 to 2018. He has been using Excel since 1986 - version 0.99 (on the Macintosh)! He was a contributing editor to Inside Microsoft Excel for many years, a magazine devoted exclusively to Microsoft Excel and published by The Cobb Group and later Ziff-Davis. At the time, most issues contained either an article by Mr. Umlas on using VBA (Visual Basic for Applications) or some tip or technique from him on using Excel. He has had more than 300 articles published on subjects ranging from beginner to advanced macros, and on tips, shortcuts, and general techniques using virtually all aspects of Excel. Mr. Umlas was voted an “MVP” (Most Valuable Professional) by Microsoft each year from 1994-2018 (25 years!) for his contributions to the various online Forums about Excel and is known world-wide for his contributions in Excel. As an MVP, he met yearly with his fellow MVPs at Microsoft’s headquarters in Redmond, where he had access to the product developers. He has been a beta tester for new versions of Excel since version 1.5 and was asked by Microsoft for his input for newer versions of Excel. In 1995 he led a session called "Maximizing Excel Development Using Array Formulas" at Microsoft's Tech Ed Conference in New Orleans, and he led a session called Tips and Tricks at a Microsoft convention in New York City. He has also led two Excel sessions (Array Formulas, Tips & Tricks) at the Advisor's Developer Conference in San Francisco in February 1998. He has led 5 sessions at an Excel User Conference in Atlantic City on Tips & Tricks, Array formulas, VBA, Formulas, and User forms. He has led at about 7-8 of these user conferences since 2005. He is also the author of “This isn’t Excel, it’s Magic!”, “Excel Outside the Box”, “More Excel Outside the Box”, “Cool Excel Sh*t” is more tips & tricks and lastly, published for Kindle, is “Excel Preschool: Finally Understanding what Excel is all About” – a book for the very beginner! He has co-authored several chapters in many books on Excel and has done the technical editing for 4 books for Excel 2019, as well as about 12 books for prior versions of Excel and 4 books for Office 365’s Excel. He is also the technical editor of many of Bill Jelen’s books. Mr. Umlas used to co-lead the New York PC User's group on Excel every month for about 10 years. He started leading this group again in 2018. He has been teaching Excel to individuals and corporations for several years. Currently, Mr. Umlas leads a 12-hour class in Excel called Excel in Depth and a 6-hour class on VBA.