29. John Zimmer, Logan Green

Co-founders, Lyft

2013 was the year when ride-sharing startup Lyft really made a dent in the transportation space. Last year, Lyft expanded its service into the San Francisco East Bay Area, from Oakland to Castro Valley, and some of the suburbs of Los Angeles, Calif., like Pasadena and Malibu.

Lyft also ditched its donation-based model in California to set payments determined by the company. The service initially operated on donations because it wasn't legal to charge for ride sharing in California. But as of September, the California Public Utilities Commission legalized the practice, allowing Lyft to make the switch.

In March, Lyft raised a $60 million round led by Andreessen Horowitz. The transportation startup has raised $82.5 million to date. As of December 2013, Lyft has seen its revenues grow at a rate of about 6% every week.