He continued his studies at Christian Medical College, Vellore, obtained his Doctorate in Cardiology (DM) in 1973 and started his career there as associate professor.
In 1983 he was invited to work at the University of California, Los Angeles, and became one of the pioneer research workers in Doppler echocardiography and co-authored the first book on this subject from USA (1985).
His effort in the 1980s in conducting continuing medical education programme all over India resulted in establishment of 2-D echocardiography as the most popular cardiology investigation in this country.
With help from the World Health Organization and Government of India he demonstrated that heart attacks and its risk factors are very highly prevalent among the poor people of Kerala.
[4][5] He is a member of the editorial board of the Indian editions of Circulation and Hypertension and is the Chairman of the Echocardiology Council of the Cardiological Society of India.