[2] Beside his pastoral works, the bishop's multidimensional approach to the promotion of education and socio-cultural economic measures benefited different sections of Thanjavur society.
He was an outstanding seminarian there at Urban college and a member of the literary association, editing and publishing newsletters and compering programs in the Radio Vatican.
He formed two social service societies at Thanjavur and Pudukkottai that helped uplift the status of the poor.
Because of his efforts, there is phenomenal increase in the number of educational, religious and social welfare institutions in and around Thanjavur.
Even today, the diocese of Thanjavur has the highest number of boarding homes for students in India.
Sundaram's efforts, on 4 April 1961 the hospital was opened by Mrs. Lourdammal Simon Minister of Local administrative of Tamil Nadu with 16 beds and 3 sisters.