Bill Cullen

First of all, you can't put "Biography" and "Bill Cullen" together without mentioning that it's already been done in book form.  My friend and colleague Adam Nedeff wrote Quizmaster: The Life & Times & Fun & Games of Bill Cullen, and you should go buy a copy.

Meanwhile, since Adam has already covered Bill in great detail we couldn't possibly match, here is a picture of a group of people who sort of look like him (contestants in a  lookalike contest).