John O’Callaghan has worked at the NTSB for over 22 years and currently serves as the NTSB’s technical expert in the aerodynamics and physics of flight vehicles. He has served as aircraft performance group chairman on several aviation accident investigations, including American Airlines flight 587 (2001), US Airways flight 1549 (2009), the Gulfstream G650 flight test accident (2011), and the Virgin Galactic SpaceShipTwo flight test accident (2014).

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