He is an elder statesman and colorful politician who played significant roles in the events that shaped the Nigerian state in the past 30 years. Kingibe was at different times the Senior Political Counselor, Nigeria High Commission London and Ambassador to Greece, Cyprus and Pakistan between 1981 and 1985.

Before then, he was the Principal Secretary, Political, in the Supreme Military Headquarters between 1976 and 1979. A thorough bred bureaucrat, Kingibe became Permanent Secretary in the presidency in 1986. He had also at various times been minister of Foreign Affairs, Internal Affairs, and Power and Steel between 1993 and 1998. He was elected the National Chairman of the defunct Social Democratic Party (SDP) and as its Vice-presidential candidate in 1993.

Between 2002 and 2006, Ambassador Kingibe worked for the African Union as one of the Facilitators of the Inter Congolese Dialogue which ended the long running conflict in the DRC. He was the African Union Representative to the Sudan Peace Talks in Kenya and headed The African Union Mission in Darfur. In a bid to tap from his wealth of experience, he was appointed Secretary to the Federal Government in 2007, a position he held until 2008. Kingibe is a Commander of the Federal Republic of Nigeria (CFR).

In 2017, He became the Chairman of Regency Alliance Plc.