20. Ken Griffin
Griffin, 44, is worth an estimated $4.4 billion. He made his money through his Citadel Group, which had a 25 percent return in 2012.
19. Jerry Yang
Yang, 44, left, is worth an estimated $1.7 billion. Yang made his money by founding Yahoo. He left the company in January 2012.
Einhorn, 44, is worth an estimated $1.4 billion. He made his money by founding the hedge fund Greenlight Capital.
Frantz, 44, is worth $5.5 billion and is the daughter of the late Dan Duncan, who was formerly the richest man in Houston. Duncan died in 2010.
Lefkofsky, 44, is worth an estimated $1.75 billion. He made his money as an investor and founder of Groupon.
Musk, 42, is worth an estimated $8 billion. Musk has numerous projects, but he is most notably associated with Tesla, a luxury electric carmaker.
Ziff, 41, is worth an estimated $4.6 billion. He is the son of publishing czar Williams Ziff Jr., who died in 2006.
Rubin, 41, is worth an estimated $2.3 billion. He made his money from the e-commerce company GSI Commerce. The company was purchased by eBay for $2.4 billion in 2011.
Plank, 41, is worth an estimated $1.7 billion. He made his money by starting Under Armour Inc.
Page, 40, is worth an estimated $24.9 billion. Page co-founded Google with Sergey Brin.
Brin, 40, is worth an estimated $24.9 billion. He made his money by co-founding Google with Larry Page.
Arnold, 39, is worth an estimated $2.8 billion. He made his fortunes working in the hedge fund business. He is one of two young billionaires from Houston.
Coleman, 38, is worth an estimated $1.4 billion. He made his money through his Tiger Global hedge fund.
Woodman, 38, is worth an estimated $1.3 billion. He made his money by founding GoPro.
Dorsey, 36, is worth an estimated $1.3 billion. He made most of his wealth by investing in the mobile payment company Square. Oh, he also started Twitter.
Pera, 35, is worth an estimated $1.95 billion. He made his money by starting Ubiquiti Networks. He purchased the Memphis Grizzlies in 2012.
Parker, 33, is worth $2 billion. Parker started Napster, and he also served as Facebook’s first president. He did all of that before turning 25.
Duncan, 30, is worth an estimated $5.5 billion. He inherited his fortune from Dan Duncan, founder of Enterprise Products Partners. He is the fourth youngest billionaire and one of two young billionaires from Houston.
Zuckerberg, 29, is worth $19 billion. Zuckerberg made his cash after starting up Facebook.
Moskovitz, 29, is worth $5.2 billion, and he’s the world’s youngest billionaire. Moskovitz was Mark Zuckerberg’s former roommate, and he helped launch Facebook with Zuckerberg.
• Don't insult other visitors. Offensive comments will be deleted without warning.
• Comments are accepted in English only.
• No swearing words in comments, otherwise such comments will be censored.
• Your nickname and avatar are randomly selected. If you don't post comments for 7 days, they both are reset.
• To choose another avatar, click the ‘Random avatar’ link.
