In this post, I interview Peter O’Hearn, programming languages professor, researcher, and evangelist. Peter now works at Facebook on the Infer static analyzer, which was publicly released back in June 2015. In this interview we take a brief tour of Peter’s background (including his favorite papers) and the path that led him and Infer to Facebook. We discuss how Infer is impacting mobile application development at Facebook, and what Peter hopes it can achieve next. Peter also shares some lessons he’s learned at Facebook regarding PL research and the sometimes surprising impact PL researchers can and are having on industrial software development.