From the article: "Today, Boom has 11 people, six of them pilots... Unlike Scholl, these folks have serious industry bona fides. Joe Wilding, the co-founder and chief engineer, was a standout at three aerospace startups, designing passenger planes from scratch. Andy Berryann, the head of propulsion, used to work at Pratt & Whitney, building parts of the engine for a supersonic fighter jet. Other employees came from NASA, Lockheed Martin, and a Northrop Grumman subsidiary, Scaled Composites."