H. William "Bill" Dettmer is Senior Partner at Goal Systems International (GSI), a consultancy specializing in complex system problem solving and strategy development and deployment. In a 23-year Air Force career, he amassed 4,000 flying hours as a B-52 pilot and navigator, including two tours in Southeast Asia. Prior to forming GSI, he taught graduate-level courses in systems management for the University of Southern California's Institute of Safety and Systems Management. Dettmer is the author of seven books on constraint management and the Logical Thinking Process.