David M. Cattler is a transatlantic security leader and strategic advisor focused on alliance resilience, intelligence integration, geopolitical risk, and the intersection of technology and national security.|

He most recently served as Director of the U.S. Defense Counterintelligence and Security Agency (DCSA), leading a global enterprise responsible for safeguarding the trusted workforce and industrial base underpinning U.S. national security. Prior to that, he served as NATO Assistant Secretary General for Intelligence and Security, where he led the Alliance’s intelligence and security enterprise during a period of intensifying strategic competition, hybrid threats, and geopolitical disruption.

Over a career spanning more than three decades across NATO, the White House, the Intelligence Community, the Joint Staff, and the U.S. Navy, Mr. Cattler has worked at the forefront of strategic warning, alliance decision-making, resilience, and institutional modernization.

Today, he advises companies, boards, and organizations operating at the intersection of security, innovation, and transatlantic strategy. He is Founder and Managing Principal of Ironhelm Works LLC and serves on multiple advisory boards focused on defense, technology, and dual-use innovation. He is also affiliated with the International Centre for Defence and Security (ICDS) and the Center for European Policy Analysis (CEPA).

A frequent speaker and commentator on the future of the Euro-Atlantic security environment, Mr. Cattler focuses on how governments, alliances, and industries adapt to an era defined by strategic fragmentation, technological disruption, and contested resilience.