In 1634 he was appointed Governor-General of Swedish Livonia and Ingria and Master of Horse of the Realm, and was appointed to the Privy Council of Sweden alongside several of his Oxenstierna relatives in 1641. Oxenstierna died without issue in Riga in 1643.
In 1634, he was appointed Governor-General of Swedish Livonia and Ingria, and Master of Horse to the Realm, and was also appointed to the Swedish Privy Council alongside several members of his Oxenstierna family in 1641.  Oxenstierna died childless in Riga in 1643.