Jessica Livingston is a founding partner at Y Combinator. She is also the organizer of Startup School, the big annual startup conference, and the author of Founders at Work, a collection of interviews with successful startup founders. Y Combinator was the first of the new startup "incubators" that fund a bunch of startups at once. Since 2005 YC has funded over 560 companies, including Dropbox, Airbnb, Stripe, and Reddit.