Dr Kariuki is a graduate of the University of Nairobi, and the University of York, UK, where he undertook his PhD studies in immunology.
He was the Director of the Institute of Primate Research/National Museums of Kenya, which is a WHO Collaborating Centre for Tropical Diseases and Human Reproduction located in Nairobi, Kenya for seven years.
His research interests span the immunology of infectious diseases and research capacity development for biomedical sciences. He has been involved in global research efforts to develop vaccines, drugs and diagnostics for major and neglected infectious diseases of poverty.
He has published widely in major journals on infectious diseases research and on policy issues related to biomedical sciences, capacity development and funding for African R&D priority areas.
He is a recipient of various international awards including Fellowship of the African Academy of Sciences; Senior Fellowship of the European Foundations Initiative for Neglected Tropical Diseases, and national honours of the Order of Grand Warrior of Kenya for scientific leadership and public service. He is a past President of the Federation of African Immunological Societies (FAIS) and founder board member of the African Research Network for Neglected Tropical Diseases, among others.