H.E. John Dramani Mahama, former President of the Republic of Ghana and the Pan Africanist, Professor P. L. O. Lumumba paid a courtesy call on the Vice-Chancellor of KNUST, Professor (Mrs.) Rita Akosua Dickson ahead of the 11th President John Evans Atta Mills Commemorative Lecture held this afternoon, 27th July, 2023 at the KNUST School of Business Post Graduate Auditorium.