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I`m a Microsoft Excel MVP (Most Valuable Professional) and have been since the inception of the program in 1995. I can answer every kind of Excel question except: API, Importing/exporting to other programs (powerpoint, word,...) Also check out my in-person training link at http://www.thumbtack.com/ny/new-york/excel-training/

Experience in the area

Worked with MS Excel since version 0.99 (on the Mac!). Was contributing editor to Excellence Magazine, having written >300 articles. John Walkenbach said of me "I finally met someone who knows as much about Excel as I do."


Excellence, The Expert, Microsoft


BA in math, Hofstra University, 1965

Awards and Honors

Led sessions for the Convergence 2004-2006 seminar on Excel tips & tricks

What do you still hope to achieve/learn in this field?


Something interesting about this subject that others may not know:

See my book, This isn't Excel, it's Magic! at http://www.iil.com/iil/excelmagic

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Alan11/19/16101010Very prompt and extremely helpful
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Chris10/26/16101010This guy is truly an expert. I .....

Recent Answers from Bob Umlas

2016-11-15 structured references in Data validation list specification:

Define a name, say List, which is equal to the column you want in the table. If the title is Part Number, then the List can be defined as   =Table1[[#All],[Part Number]]    (This assumes the name of the

2016-11-14 structured reference to column:

If you select the entire column including the header and total if present, excel will give you the right syntax. In this formula,  =SUMIF(Table1[[#All],[Month]],"Mar",Table1[[#All],[Actual]])  this references

2016-11-14 information flow between tables:

2 solutions come to mind (Using VLOOKUP formulas or using PowerPivot and related tables), but without seeing the exact nature of the data, it's hard to know which is best suited for you. Can you send me

2016-10-26 switching entries:

Put something in cell C1, then run the macro GetString:    Sub GetString()      CurrentRow = 1      Call GetPermutation("", [c1])  End Sub    Sub GetPermutation(x As String, y As String)      Dim i As


A few issues:  INDEX(C3:G11... requires 2 arguments, not one, as you supplied. The first is the row entry and 2nd is the column entry. So =INDEX(C3:G11,2,3), for example, would be the 2nd row down (from


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This topic answers questions related to Microsoft Excel spreadsheet (or workbook) stand-alone or Mircrosoft Office Excel including Excel 2003, Excel 2007, Office 2000, and Office XP. You can get Excel help on Excel formulas(or functions), Excell macros, charting in Excel, advanced features, and the general use of Excel. This does not provide a general Excel tutorial nor the basics of using a spreadsheet. It provides specific answers to using Microsoft Excel only. If you do not see your Excel question answered in this area then please ask an Excel question here


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