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 IMAGE: Download Image: Full Size (0.12 MB) Photo By: screen capture VIRIN: 200910-O-ZZ999-001M.JPG Photo Gallery