Why was Garrison Keillor famous on public radio?

He was the mastermind behind "A Prairie Home Companion," which made him a household name by blending storytelling, folk music, and that fictional town of Lake Wobegon where "all the women are strong, all the men are good-looking, and all the children are above average." That show ran for decades on NPR, and his warm, folksy delivery turned him into the king of public radio, like the friendly uncle who always had a yarn to spin.