Keith M. Boyer is Vice President for Propulsion for Practical Aeronautics, Inc. He has 40 years' experience in aircraft and engines including flight line, unit-level and depot-level maintenance, research and development, test and analysis, sustainment, systems engineering, logistics, supply chain, and multinational requirements management. In over 32 years in the Air Force, he taught at the U.S. Air Force Academy and was an adjunct faculty member at the U.S. Air Force Test Pilot School in the 2000s. He is co-author of the textbook Elements of Propulsion: Gas Turbines and Rockets, Second Edition. He holds a Ph.D. in M.E. from Virginia Tech.