The colloquial term (also "big shot" or "big wheel") is indeed "bigwig".
Check Out Maven's "Word of the Day", which happened to be BigWig. http://www.randomhouse.com/wotd/index.pperl?date=19980818
bigwig`s password is: tecnoligy123
Bigwig - band - was created in 1995.
The word for an "Oxford bigwig" would likely be don.
bigwig
that would probably be a "Sheikh", i doubt i would call him a bigwig to his face though :)
Imam
Imam
bigwig
Bud Selig?
Fatcat; bigwig.