In 2013, Tony Xu was brainstorming ideas for a business school project when he identified a problem he wanted to solve: food delivery. For most restaurants, it was too costly and inefficient, leaving most of the market to pizza and Chinese. Tony and his partners believed they could use technology to connect customers to drivers, who would deliver meals in every imaginable cuisine. That idea grew into DoorDash, a company that's now delivered over 100 million orders from over 200,000 restaurants across the country. PLUS in our postscript "How You Built That," we hear from the winner of our 2018 HIBT Summit Pitch Competition: Ashlin Cook. She combined her love for dogs with an entrepreneurial itch to create Winnie Lou: a Colorado business that sells healthy dog treats in independent pet stores and from a food truck.