Dr. Nainar served as the head of the Department of Oriental Studies at the University of Madras for nearly three decades until his retirement in 1953. Among his other notable works are The History of the Nawabs of Carnatic (Karnataka) – a 13-volume encyclopaedic work produced under his editorship; Tuhfatul Mujahideen – an English translation of the 10th century historical document in Arabic on the arrival of the Portuguese in Kerala in South India; a biography in Tamil on Seethakathi Vallal, a Muslim sage and philanthropist of the 18th Century; besides several English monographs on the aspects of Arabic, Tamil, Hindi and Urdu linguistics. Dr. Nainar was deputed as visiting professor to Indonesia by the Indian Council of Cultural Relations, Government of India, in 1953 for the research on the cultural links between India and Indonesia. As a result of this visit, he wrote a monograph on Java as noticed by Arab geographers. Besides his academic interests, Dr. Nainar was also involved in journalism. He founded the Tamil daily Swatantira Nadu (Independent Nation) and the commercial Noori Printing Press. Dr. Nainar served as the Head of the Bahasa Indonesia Unit of the All India Radio in 1959/1960. He was invited by the Venkateshwara University in Tirupati, Andhra Pradesh to set up the first Arabic department there. He served as the Head of the Department of Arabic until his death in September 1963 at the age of 65.