This Festschrift, dedicated to Robert Nicolai, consists of twenty-seven articles, grouped in two volumes (Vol. 1: Language Contact and Epistemological Issues, Vol. 2: Contact and Language Change in Africa). It also contains an interview with Robert Nicolai: who could explain his scholarly trajectory and stature better than he himself. All contributions deal with at least one of the research areas to which his works can be ascribed, especially African linguistics, contact linguistics, and epistemology.