Next up in our series of episodes from the How I Built This Summit: John Zimmer, co-founder of Lyft. John sat down with Guy Raz in front of a live audience in San Francisco last month to talk about Lyft's visions for the future of transportation – and their fierce competition with Uber. Coming up next month: three more episodes from the Summit – so keep checking your podcast feed every Thursday. Learn more about your ad choices. Visit podcastchoices.com/adchoices