 He passed "studentexamen" in Lund in 1851 and devoted himself after passing "kansliexamen" in 1855 to the diplomatic course and became attaché in Paris in 1858 after first been serving as temporary office clerk at the Ministry of Civil Affairs in 1856 and as "valet de chambre" in 1857.He was acting second secretary at the Ministry for Foreign Affairs in 1859 and permanent in 1861.Lewenhaupt became legation secretary in Saint Petersburg in 1863 and was appointed chamberlain the same year.