Beginning in September 1929, he studied sculpture at the Académie de la Grande Chaumière in Paris, France. He then studied at the Yale School of Architecture until 1934. Later, he toured Europe and North Africa for a year and returned for a year to his native Finland. He returned to Cranbrook to work for his father and teach at the academy. He became a naturalized citizen of the U.S. in 1940. Saarinen was recruited by his friend, who was also an architect, to join the military service in the Office of Strategic Services (OSS). Saarinen was assigned to draw illustrations for bomb disassembly manuals and to provide designs for the Situation Room in the White House. Saarinen worked full time for the OSS until 1944. After his father's death in 1950, Saarinen founded his own architect's office, "Eero Saarinen and Associates". Eero Saarinen died of a brain tumor in 1961 at the age of 51.