Age: 30

The California native became the first hacker to be charged with controlling an army of hijacked computers—called botnets—to send large quantities of spam across the Internet. He used the worm "rxbot" in 2004 to take control of 500,000 computers (which included U.S. military computers) and used their combined strength to take down major sites. He then put out ads for his services, and offered clients the opportunity to take down any website they wanted, for a price. Ancheta​ was caught in 2005 when one of his clients turned out to be an undercover FBI agent. He had to give up the $58,000 he made from hacking, pay back $16,000, give up his BMW, and serve 60 months in prison.