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Tina Fey
Actress; creator and star of 30 Rock

About 15 years ago, I saw an Oprah show where she said, "Always be the only person who can sign your checks." At the time, I had no money. I was at Second City in Chicago. I came to New York in 1997 to work on Saturday Night Live. I realized I have no head for business. And it would have been very easy for me to let someone take control of my money - for me to say, "Here, sign my checks...whatever." But that line from Oprah has always been a reminder. Today, as much as it makes me super sleepy, I have to pay a lot of attention when my business manager talks to me about money. He talks to me about taxes, and I get really, really sleepy. But I listen.

NEXT: Mark Hurd
Last updated April 30 2008: 4:31 PM ET