Early in his career he had held key positions in the national Intelligence Bureau and Ministry of Home Affairs.

He later resigned from Ministry of Home Affairs, IPS to be closer to family and to take care of his ailing father.

Sundararajan taught law in Trivandrum for over 15 years as a part-time lecturer and as a visiting professor.

He was familiar with all branches of law at the Original, Trial, Appellate and Special-Leave Jurisdiction in all Courts and Tribunals.

He was born in a higher upper middle class Tamil Brahmin scholarly family.

Having learnt the Sanskrit texts and ancient philosophies from his parents at an early age, he held it his utmost duty to follow them in all circumstances.

He belonged to the Hindu subsect of Sri Vaishnavism, whose roots are based on the teachings of Bhagawad Ramanuja.

He suffered from fever for over a couple of days followed by a heart attack in the early hours of 17 July 2011 when he breathed his last amidst his family members.