He came to power on December 31, 1977. Sheikh Jaber led the country wisely using his experience in financial matters to benefit his country especially regarding the organization of Kuwait's internal and external financial affairs. Effective foreign relations made him able to best serve the interests of Arab and Islamic nations.
Sheikh Jaber was a strong advocate of Arab unity and fully supported political and economic powers in the Gulf and the Arabian Peninsula. He played an important role in the establishment of the Gulf Cooperation Council, and the first historic summit of the organization was held in the United Arab Emirates in 1981.
The Fifth Islamic Conference was held in Kuwait, and Sheikh Jaber was elected as Chairman. During his tenure, he contributed greatly to the strength of the organization by promoting its work and ambitions at the international level. He also drew up many of the rules upon which it is established.
Sheikh Jaber played a vital role in bringing together an international coalition to restore Kuwait's sovereignty and independence after the Iraqi invasion and subsequent occupation of Kuwait in 1990.
He worked closely with fellow Arab countries and other allies to ensure Kuwait's liberation from its aggressors.
After the liberation of Kuwait, Sheikh Jaber led the efforts to reconstruct the country and to remove the physical and mental scars of the invasion from Kuwait and its people. In this, he was remarkably successful and the regeneration of Kuwait began after a surprisingly short amount of time - surpassing the international community's expectations.