Based in Warsaw in past months, Jeglinskas' earlier positions included Citigroup capital markets and corporate finances specialist in Sydney, Singapore and Tokyo. He has been an officer in Lithuania's Armed Forces. Jeglinskas is a graduate of the West Point academy in the United States, which he graduated with a degree in political sciences. He also has a master's degree in national security from the Georgetown University in Washington and a master's degree in business administration from the Columbia Business School in New York.

Kerza was lately coordinating key information system projects at the Foreign Ministry and the Lithuanian mission at the European Union. His functions at the Defense Ministry will include cyber security, hybrid resistance, budget formation and implementation.

Kerza has a master's degree in statistics and a bachelor's degree in engineering informatics from the Vilnius Gediminas Technical University.