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N. Viswanathan (1929 – 17 November 2010), popularly known as Calcutta Viswanathan in theTamil film industry, was an Indian actor and academic. A Tamilian by birth, he moved to Calcutta(now Kolkata) at a young age and joined St. Xavier's College, Calcutta as an English professor and continued to teach there for more than 40 years. Viswanathan was also a well-known public speaker. He started acting films after entering into the Bengali films by acting in Mrinal Sen'sPunascha and Satyajit Ray's Kanchenjungha.[2] In an acting career spanning over 40 years Viswanathan appeared in nearly 100 films in Bengali, Tamil and English. Viswanathan was a member several theatre groups and also formed the "Calcutta Players", an acting troupe