Bill Kollar has had a long career in the NFL as a defensive line coach.
He generally has gotten the most out of his talent. Some of the DL groups that he had to work with were bereft of talent (others had top draft picks). Bill Kollar challenges his players to excel and calls them out when they don't. His style is much closer to Alex Gibbs than it is to John Fox.
"Bill is loud," says defensive coordinator Wade Phillips, "but he's got a great knack for getting on people, getting them to go harder, but for them to like him.