Lee, 32, got her start in tech at Google(GOOGL) under Marissa Mayer. While at Google, Lee sent an e-mail with product suggestions to a startup she was an active user of: social shopping site Polyvore. That note led to a job offer. Lee became CEO and honorary cofounder of the company and led Polyvore through its sale to Yahoo(YHOO) in August (where Mayer is now CEO).
Best advice: "I've always been a bit of an introvert, but just because you don't fit the classic mold doesn't mean you can't be a leader. You just need to find your own style and someone with a similar style who you can learn from."