When Nazi Germany invaded the Soviet Union and Lithuanians started the anti-Soviet June Uprising, Landsbergis became the minister of infrastructure in the short-lived Provisional Government of Lithuania. When his son was arrested by the Gestapo in May 1944, Landsbergis followed his son from one prison to another until Gabrielius was freed by the Americans in April 1945. Landsbergis became a displaced person (DP) and taught at a Lithuanian DP camp and later at the University of the United Nations Relief and Rehabilitation Administration (UNRRA) in Munich. In 1949, he emigrated to Australia and worked there as an architect at the Housing and Construction Department in Melbourne. In 1959, he returned to Kaunas in Soviet Lithuania and worked as architect and restorer of monuments until retirement in 1984.