Antoine and Ryan had always wanted to join Y Combinator. They were obsessive about HackerNews—they even got me to read it.Right before we applied for YC, Antoine was diagnosed with a rare form of cancer. At that point Ralph and I decided to quit our jobs. We took a train to Chicago to hang out with Antoine and worked on several projects with him. PlanGrid was just one of them.We all applied to YC in October of 2011; Antoine was already really sick at that time. I remember how happy it made him when we were accepted. He was able to come to the first YC dinner that winter. He passed away in January 2012 at his home in France.One of the last gifts Antoine gave to us was recruiting our fifth cofounder, Kenny Stone. Antoine had told us “Kenny is the best engineer I’ve ever worked with” and without Kenny we would not have been able to build PlanGrid to what it is today.Q: What is the most important thing you learned from working with Antoine?