A youth-marketing guru, Tina Wells, founder and CEO of Buzz Marketing Group, literally wrote the handbook: 2011's Chasing Youth Culture and Getting It Right. With clients ranging from Girl Scouts of America to Nike, her firm connects corporations and organizations to the consumer. Wells -- who founded her company when she was just 16 years old -- is also the author of a popular tween novel series, Mackenzie Blue. For her work -- both in business and publishing -- she's been named to Essence's 40 Under 40, Billboard's 30 Under 30 and Inc's 30 Under 30 -- and that's just a sample!

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