Across various genres, he has made numerous films in different languages, notably, English, Tamil, Malayalam, Irish, Swahili & Urdu.

He has also served as the jury member 50th National film Awards of India in 2003 and Kerala State Awards in 2003 Viswanath's directorial debut A Voyage is based on the works of Indian writer M. T. Vasudevan Nair, which was produced by veteran Malayalam screenwriter John Paul Puthusery.

[4] Viswanath made three Irish films based on the works on the poet writer Celia de Fréine.

[5] His First American Feature film Marathon is based on the true story of American poet William Morris Meredith, Jr. Viswanath won two awards for Best Cinematography and Best Screenplay in New York Independent Film Festival for Marathon (2010).

[1] Viswanath's venture in Swahili is Shadow Tree, a film which was shot in Zanzibar, Tanzania.