No one on our 40 under 40 list would have gotten where they are without a little help. They share with us the people who've had the biggest influence on their lives and careers.
40 under 40 rank: 3
I have two mentors. One is Evan Williams -- I continue to learn from him. The other is Steve Snider, an art director who gave me my first career-like job as a book cover
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Last updated October 22 2010: 8:09 AM ET