I have published widely on African economic development, and particularly on patterns of economic growth and on economic development statistics. My books are based on research in Ghana, Nigeria, Uganda, Kenya, Tanzania, Malawi, Zambia and Botswana. I am an economic historian, with a PhD from the London School of Economics. I currently work on linking studies on post-colonial economic development with the economic history of colonial Africa. The research project is focusing on the African growth data where the two related aims are to assess its quality and to construct a reliable basis to evaluate and interpret long term economic change in African economies.