 In between, he served in various positions such as the Secretary of Text Book Committee, as an assistant to Sadasya Tilakam T. K. Velu Pillai in the preparation of Travancore State Manual, as the assistant secretary of education to the Government of Kerala, as the honorary director of the Kerala University Manuscripts Library, as a member of Indian Historical Records Commission and University of Kerala Faculty of Oriental Studies, as the editor of Kerala Archives News Letter Board, as the chief advisor of Navasahithi Biographical Encyclopedia, as a member of the Phd Evaluation Board of University of Kerala, as the president of Sahithya Parishad, as an executive council member of the Kendra Sahitya Akademi, Kerala Sahitya Akademi and History Association, as the president of Kanfed, as the editor of the Journal of Indian History and as a member of the first Jnanpith Award Committee.He also presided over the fourth Annual Conference of Dravidian Linguists held in Chennai in 1974.Kunjan Pillai was married to C. Bhagavathi Amma (of the Panniyarathala family in Jagathy, d. 2007), the marriage taking place in 1935.