is a Consultant Psychiatrist in private practice in Nairobi, Kenya, where he has practiced for thirty years.
He was the founder President of the African Association of Psychiatrists and Allied Professions (AAPAP). Dr Njenga was appointed by the President of Kenya to chair the (NACADA) - National Campaign Against Drug Abuse Authority Board which is the body that advices the Kenya Government on Drug and Alcohol policies. In addition to his medical practice, he is Founder Chair of the Institute of Education in Democracy (IED), an Africa wide election monitoring body, as well as active campaigner for Democracy in Africa. He is an author of many scientific papers, books and book chapters, including children’s’ books.