JOHN W. WANJALA alias O’shea is a prominent author in both Kiswahili literature and revision books. He has written various books such as  Punda Amechoka, Uhakiki wa Fasihi na Isimujamii, Uhakiki wa Sarufi na Insha  Ganda la Muwa. Wanjala is a professional teacher of Kiswahili and History. Currently he is teaching at Kinyui Boys’ High School, Machakos. Formerly he was teaching at Friends Secondary School Misanga, Bungoma.