 He has also been the National Coordinator of the Nigerian Malaria Control Association (NaMCA) from 2009; the President of the Nigerian Health Economics Association (NiHEA) since 2010; and the Chairman of the University of Nigeria Senate Research Grants Committee since 2014.Onwujekwe conducts research on health economics - especially looking at the impact of the stigma of HIV/AIDS in Nigeria on the willingness to access anti-retroviral drugs, and malaria prevention strategies.His work has been important in informing international aid agencies such as DFID's aid agencies.