Jacek Siewiera is a former Secretary of State and Head of the National Security Bureau of Poland, where he served as National Security Advisor to the President during the war in Ukraine (2022–2025).
His unique interdisciplinary background—as a medical doctor, lawyer, and Polish Army lieutenant colonel (ret.)—has shaped his expertise in national security, dual-use technologies, and crisis management. He played a key role in defining Poland’s defense posture, armament policy, and NATO-level cooperation.
Known for combining medical innovation with operational leadership, prof. Siewiera founded Central Europe’s first Hyperbaric Medicine Clinic for Armed Forces and established Rescue Center, the region’s largest civil rescue organization. He led international medical missions during the COVID-19 outbreak in Lombardy and pioneered treatments for fighter pilots, earning distinctions from U.S. and European partners.
A recognized authority on hybrid threats and strategic foresight, he advises on enhancing state resilience through advanced technologies and cross-border cooperation. His service has been honored with the Knight’s Cross of the Order of Polonia Restituta, the Commander’s Cross of the Order of the White Rose of Finland, and the Grand Commander’s Cross of the Order for Merits to Lithuania.
Jacek Siewiera is a member of the Warsaw Security Forum’s National Security Advisors Council.