In 2019, she became the first female chief executive officer of a publicly traded auto retail company in the Fortune 500.

[1] Miller graduated from James Madison University with a bachelor's degree in finance and business.

[citation needed] In 1998, she moved to Florida to join a company which was the predecessor of AutoNation.

[4] As the CEO of AutoNation she oversaw 26,000 employees and 325 auto dealerships across the United States.

Miller resigned her position as CEO for AutoNation due to undisclosed medical reasons in July 2020.