A talented linguist, Louis Allen (born Louis Levy) was educated at the University of Manchester and the Sorbonne. During the Second World War, upon completion of the Services translators' course in Japanese at the School of Oriental and African Studies, he was posted to India, where he served with the Combined Services Detailed Interrogation Centre (CSDIC), the South East Asia Translation and Interrogation Centre (SEATIC), and the 17th Division.
After the war Allen became a lecturer (later Reader) in French at the University of Durham. During this time, he wrote five books on the war in the Pacific, as well as numerous articles on Japanese history, politics, and literature.