Mark Lewis Dr. Mark J. Lewis, the acting deputy undersecretary of defense for research and engineering and director of defense research and engineering for modernization, speaks about “Near Peer Competition and AI” at the DefenseNews Conference in Washington, Sept. 10, 2020. SHARE: Download: Full Size (0.12 MB) Credit: screen capture VIRIN: 200910-O-ZZ999-001M.JPG Photo Gallery