 His work on his first film won him the Tamil Nadu State Film Award for Best Editor.Kasi Viswanthan subsequently went on to collaborate as an editor in several of Prakash Raj's productions with Duet Movies.He has since regularly collaborated with directors including Radha Mohan, Suseenthiran, Seenu Ramasamy and Sundar C.

In 2016, he made his debut as an actor with a role in Suseenthiran's "Maaveeran Kittu" (2016).