Age: 29
Location: San Francisco
2007 Revenue: $2.2 million
Employees: 7
Founded: 2001
Website: www.khnsolutions.com

While selling consumer products online during his senior year at the University of Pennsylvania, Nothacker saw a business opportunity in handheld breathalyzers. He began importing the product and created a retail site. After two years of maxing out credit cards and juggling two part-time jobs, Nothacker finally gained momentum, with orders for the breathalyzers coming in from businesses, hospitals, law enforcement units, and concerned consumers. Today, the company manufactures several of its own models and has had its breathalyzers used in episodes of CSI: Miami and CSI: Las Vegas, as well as on the set of an upcoming Renee Zellweger film. KHN Solutions ranked No. 3,003 on the 2008 Inc. 5000 list of the nation's fastest-growing private companies.