Gary Klein, Ph.D., is a cognitive psychologist who helped to initiate the Naturalistic Decision Making movement in 1989. His Recognition-Primed Decision (RPD) model has been tested and replicated several times. He also developed a Data/Frame model of sensemaking, and a Triple Path model of insight. His work relies on Cognitive Task Analysis methods that he and his team developed. In addition, he has formulated the Pre-Mortem method for identifying risks and the ShadowBox method for training cognitive skills. The 5 books he has authored and the 3 he has co-edited have sold over 100,000 copies. He founded Klein Associates, Inc. in 1977 and sold it to Applied Research Associates in 2005. He started his new company, ShadowBox LLC, in 2014.