Dr. Njenga is a consultant Physician/Endocrinologist and the Chairman of the Kenya Diabetes Management & Information Centre in Nairobi, Kenya. Dr. Njenga has been in practice for 30 years and holds a MMed from the University of Nairobi. She also has certificates in Social Medicine and Medical Anthropology from Harvard University and Advanced Course for Post Graduate Doctors in Endocrinology from the University of Newcastle Upon-Tyne UK. She has formerly worked at Kenyatta National Hospital, Nakuru Provincial Hospital and Joslin Diabetes Centre in USA. She is a member of the American Diabetes Association, Kenya Medical Association and Kenya Association of Physicians, executive member of the Kenya Diabetes Association, Former Vice Chairman of the Kenya Medical Women Association, Chairman, Diabetes Management & Information Centre and a former member of the Pharmacy and Poisons Board.