President, Americas; Enterprise EVP, Best Buy Best Buy 2010 rank: 48 Age: 45
The Michigan native co-manages a huge operation: The U.S. portion of the business alone generated 74% of Best Buyís $50 billion in revenue in its last fiscal year. But while the
company boosted total sales thanks to new stores, profits dropped on restructuring charges.
The list is compiled by FORTUNE editors, who consider four criteria: the size and importance of the womanís business in the global economy, the health and direction of the
business, the arc of the womanís career (resume and runway ahead), and societal and cultural influence.