Yiwola's main research program is to prepare an electronic database for a modern dictionary of the Yoruba language, a Kwa language of the Niger-Congo family. Yiwola has joined LDC on sabbatical leave from the University of Ilorin, Nigeria where he is Professor and Head of Department of Linguistics and Nigerian Languages.
Yiwola participates actively in the teaching and planning of the Yoruba language for many years, both at university and national levels. In addition to the dictionary project, he also co-ordinates the activities of the African Language Research Council (ALRC) jointly hosted by the LDC and the African Studies Centre. He teaches Yoruba in the African language teaching program of the African Studies Centre.