Dick Costolo is an unusual guy for Silicon Valley. This interview gives a window into his background in theatre and improv comedy, and how those experiences changed his management style for the better. About halfway through, he made a great remark: “As a leader, it’s not your job to prevent mistakes from happening, it’s your job to correct them when they happen.” I could not agree more. When you’re trying to prevent errors, everything slows down, and innovation stops. It’s the opposite of what you want.