9. (210) Pam Mars-Wright, $7.62 billion
Mars-Wright, 57, served as Mars chairwoman from 2004 to 2006. "It's good for a board to rotate the personnel so it doesn't end up being the same old thing all the time," she told Campden FB in 2006. "I personally don't believe that having the same thing for 25 years is necessarily a good thing." She is a graduate of Vassar College.