 He was appointed Nigeria's Permanent Representative at the United Nations from 1962 to 1967 and as United Nations Under Secretary General and Executive General of the United Nations Institute for Training and Research until 1972.After the end of the Nigerian civil war, Nigerian Head of State General Yakubu Gowon instituted a commission to review wages and salaries of Nigerian workers and to look into means of ameliorating the economic conditions of workers, the importance of the commission was due to the rise in cost of living as a result of uncontrollable inflation during the civil war.Simeon Adebo was called to head the commission which later became known as the Adebo commission.