Esper Speech Defense Secretary Dr. Mark T. Esper said the United States must lead in development of artificial intelligence in his remarks to the virtual Artificial Intelligence Symposium in Washington, Sept. 9, 2020. SHARE: Download: Full Size (1.02 MB) Tags: Defense Secretary, Esper Credit: Marv Lynchard, DOD VIRIN: 200908-D-FW736-2001C.JPG Photo Gallery