Oliver has a wide experience and knowledge of statistical practice across Africa at both  national and international levels. A Strong believer in the effectiveness of partnerships, coordination at country, regional and international levels for effective and sustained development programs. 

He is currently the Director of the African Centre for Statistics at the UNECA. The Centre 's main mission is to enable national statistical systems in Africa to produce high quality statistics, data and geospatial information to inform sound and evidence decision-making in support of sustainable development, regional and national priorities. 

Before joining the UNECA, he worked at the African Development Bank as Manager for the Statistical Capacity Building Division in the Statistics Department, IMF as Regional Resident Advisor and Deputy Director of the Zambia Statistical Office respectively. He also worked for the World Bank as an international consultant.