Worked as Assistant Professor & Research Fellow, Nancy University (France)-till 1984. Assistant surgeon, Kerala government service-till 1987. Chief, Pulmonology department, Kovai medical center, Coimbatore-till 1992. Chief, Institute of Pulmonary Medicine and Research, Sri Ramakrishna Hospital, Coimbatore-till date. Visiting Consultant to various hospitals in Coimbatore. Visiting Professor School of Medicine, West Verginia University, Morgan town, USA.