In 1987, Al-Jubeir was appointed into the Saudi Diplomatic Service and posted to the Royal Embassy of Saudi Arabia in Washington, DC, where he served as Special Assistant to then Ambassador Prince Bandar bin Sultan. It was in 1991 during the first Gulf War when Al-Jubeir first appeared to the world as a spokesman for the Saudi government. In 1990–91, he was part of the Saudi team that established the Joint Information Bureau at Dhahran, a city in Saudi Arabia's Eastern Province, during Operation Desert Shield/Desert Storm. He was a member of the Gulf Cooperation Council delegation to the Madrid Peace Conference in October 1991, and a member of the Saudi delegation to the Multilateral Arms Control Talks in Washington, DC in 1992. In December 1992, he was dispatched with the Armed Forces of Saudi Arabia to Somalia as part of Operation Restore Hope.