Top 12 Successful Women Under 40

For Marie Claire's third annual Women on Top Awards, we combed the country for the up-and-comers leading thought-revolutions, creating businesses, and making names for themselves in fields from the military to the arts. None is a day over 40, with a couple of notable exceptions: We've added a "Super Woman" category to celebrate women of any age who made their mark on 2012. But their accomplishments speak for themselves...