组图：40位40岁以下的商界精英

24. 大卫•卡普

•年龄：27

•职务：创始人兼CEO

•任职公司：轻博客Tumblr

    卡鲁15岁从中学辍学。当时，他制定了多个人生规则：“我想要驱动软件，我还想开发在线产品，”他回忆道。过去已成为历史。后来，他创建了轻博客Tumblr，共有1.36亿个博客。今年年初，Tumblr以11亿美元的价格出售给了雅虎公司。据称，在新东家和CEO玛丽莎•梅耶尔（见排名第1位）的领导下，Tumblr的目标是今年广告销售收入达到1亿美元，而它去年的广告销售收入约为1,300万美元。

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.