Cyber Chat Defense Secretary Dr. Mark T. Esper speaks with the Cybersecurity and Infrastructure Security Agency director, Christopher C. Krebs before delivering remarks at CISA’s national cybersecurity summit in National Harbor, Md., Sept.19, 2019. SHARE IMAGE: Download Image: Full Size (3.74 MB) Photo By: Lisa Ferdinando VIRIN: 190919-D-BN624-0181.JPG Photo Gallery