組圖：40位40歲以下的商界精英

24. 大衛?卡普

?年齡：27

?職務：創始人兼CEO

?任職公司：輕博客Tumblr

????卡魯15歲從中學輟學。當時，他制定了多個人生規則：“我想要驅動軟件，我還想開發在線產品，”他回憶道。過去已成為歷史。后來，他創建了輕博客Tumblr，共有1.36億個博客。今年年初，Tumblr以11億美元的價格出售給了雅虎公司。據稱，在新東家和CEO瑪麗莎?梅耶爾（見排名第1位）的領導下，Tumblr的目標是今年廣告銷售收入達到1億美元，而它去年的廣告銷售收入約為1,300萬美元。

24. David Karp

?? Age:27

?? Title:Founder and CEO

?? Company:Tumblr

????When Karp dropped out of high school at age 15, it wasn't without a life plan: "I wanted to drive software, and I wanted to build stuff on the Internet," he recalls. The rest is history: He built Tumblr, which hosts over 136 million blogs, and sold it to Yahoo earlier this year for $1.1 billion. Under its new parent—and CEO Marissa Mayer (see No. 1)—Tumblr is reportedly aiming for $100 million in sales this year from advertising, up from an estimated $13 million generated last year.