Fili-Krushel took charge of the revamped news group last July. She recruited Deborah Turness to head NBC News. They face the daunting task of reviving the Today show, now No. 2 to ABC's Good Morning America.
The Most Powerful Women in Business list is compiled by FORTUNE editors, who consider four criteria: the size and importance of the woman's business in the global economy, the health and direction of the business, the arc of the woman's career (resume and runway ahead), and social and cultural influence.