Founded: 2001
Age: 29
Location: Phoenix
Employees: 100
2007 Revenue: $12.5 million
Website: www.944.com

Marc Lotenberg founded 944 Media, a marketing company that publishes a lifestyle and entertainment magazine, using money he had received for his Bar Mitzvah and "an unbelievable amount of credit card debt." In total, he says he maxed out seven or eight cards to launch 944, which publishes editions in Las Vegas, Miami, and five other cities across the country and also promotes celebrity events. Next up: New York. A successful publishing company in a new media world? "There were always naysayers," Lotenberg boasts. "Now they work for us."