Host Jim Lewis interviews Keith Alexander, a retired four-star general who served as commander of the United States Cyber Command and director of the National Security Agency in the Bush and Obama administrations. Listen in to hear how General Alexander helped establish and structure U.S. Cyber Command. General Alexander talks about NSA modernization, the different responsibilities that the Department of Defense, Federal Bureau of Investigation, and the Department of Homeland Security have to address cybersecurity threats; the current threats in cyberspace; and the merits of persistent engagement.