John Zimmer and Logan Green

Winni Wintermeyer for Fortune
  • Age
    33, 33
  • Title
  • Company

The entrepreneurial duo has had a less eventful year than Travis Kalanick -- but that's a good thing. While Uber, their much larger competitor, struggles without a leader, Lyft has hit the gas. In July, the pair announced Lyft's new self-driving division, and launched a system that could one day enable car manufacturers to develop autonomous vehicles more quickly. They also raised $600 million in a funding round at a cool $7.5 billion valuation.

40 Under 40

List Debut2014