Dr. Mark J. Lewis is a senior American aerospace and defense executive with special expertise in hypersonics. He is currently the Executive Director of the National Defense Industrial Association's Emerging Technologies Institute, following his role in the second half of 2020 as the acting US Deputy Under Secretary of Defense for Research and Engineering, and before that the Director of Defense Research and Engineering for Modernization. He was the Chief Scientist of the U.S. Air Force, Washington, D.C. from 2004 to 2008 and was the longest-serving Chief Scientist in Air Force history. He served as chief scientific adviser to the Chief of Staff and Secretary of the Air Force, and provided assessments on a wide range of scientific and technical issues affecting the Air Force mission. In this role he identified and analyzed technical issues and brought them to attention of Air Force leaders, and interacted with other Air Staff principals, operational commanders, combatant commands, acquisition, and science & technology communities to address cross-organizational technical issues and solutions. His primary areas of focus included energy, sustainment, long-range strike technologies, advanced propulsion systems, and workforce development.
