Thanks for your response but it still doesn't work. It seems that
'Shapes' isn't a valid member either. This is what I tried:

sheet.Shapes.AddPicture(PATH_TO_LOGO,true,false,10 0,100,100,50);

Not sure if the problem is 'ActiveSheet' or not. I realize that
ActiveSheet is valid in VBA, but I tried 'book.ActiveSheet' but that
didn't work either. Using the ObjectBrowser is less than satisfactory
(it doesn't even give you a view into the Cell object). It's very
frustrating trying to find documentation on how to use the Excel object
effectively. A lot of guess work....