He was appointed lecturer of the
University of Ghana in 1958. As a lecturer of the University of Ghana, he rose through the ranks to become a senior lecturer and later; professor of chemistry in 1974. While at the university he was appointed master of Legon hall. From 1971 to 1973, he was dean of the faculty of science at the university. He was appointed pro vice chancellor in 1973 and vice chancellor of the university from 1976 to 1983. He spent various periods at the
University of Ibadan,
Nigeria and also at the
University of California, Los Angeles as an advanced research scholar. In 1980, he was appointed president of the
International Council of Scientific Unions (ICSU). On 26 September 1983 he was elected as a member of the
Pontifical Academy of Sciences, that same year he became a founding fellow of
The World Academy of Sciences. He joined
UNESCO Regional Office of Science and Technology for Africa in
Nairobi,
Kenya as its director. In October 1983 he was the UNESCO Representative to
Kenya,
Mauritius,
Seychelles,
Somalia,
Tanzania and
Uganda, he served in this capacity until December, 1985. In January 1986, he became the Regional Director for Eastern and Southern Africa, International Development Research Centre of Canada in Nairobi, Kenya until his retirement in March 1992. From 1978 to 1982 he served on the Council of the
United Nations University,
Tokyo,
Japan. He was a member and subsequently chairman of the
Council of State from 2005 to 2008 and also chairman of the
Ghana Atomic Energy Commission (GAEC). He was also a member of the
Institute of Economic Affairs board of directors. == Death ==