Whilst I would agree that Shakespeare would be in the group counted as "greatest author
s of all times" (I once again stress the plural), again I have to question the entire concept, on several levels. What about some of the writers already mentioned, such as Homer, Thucydides, etc., whose works have been around a lot longer, and who have influenced culture(s) for a longer period -- including having their effect on Bill himself? What about other cultures? Again, while Shakespeare is certainly known, read, seen, and appreciated in all (or nearly?) all languages, would he be given title of the greatest of all times across the board? Or even enough to make it a general consensus? And so on....
I just don't think it is really possible, given the entire history of literature, worldwide, to pick a single "greatest" author....
Oh, and mosaix: Ah, but you have now given the question I posed a
context... which opens up an entirely new can of vermicelli....