After completing his M.A. in 1954 and his D.Phil. at Oxford from 1954 to 1956, he returned to academic life with stronger linguistic training. From 1956 to 1965, he served as Senior Lecturer in Tamil at Peradeniya. During this period, his scholarship developed across Tamil grammar, classical language study and comparative linguistics.
நூற்றாண்டு நாயகன் - பேராசிரியர் ஆ.சதாசிவம் அவர்களின் நூற்றாண்டு விழா- பேராதனைப் பல்கலைக்கழகத் தமிழ்த்துறை 05.03.2026