Recognised author who has written several books, five of which have been adapted into Bollywood films like 'Hello' in 2008 (based on 'One Night @ the Call Center'), '3 Idiots' in 2009 (based on 'Five Point Someone'), 'Kai Po Che!' in 2013 (based on 'The 3 Mistakes of My Life'); '2 States' in 2014 and 'Half Girlfriend' in 2017, both based on his novels of the same names. He also writes op-ed columns for English and Hindi newspapers, including The Guardian, The Times of India and Dainik Bhaskar. Chetan is also a motivational speaker who has spoken at more than 300 organizations in 50 cities around the world. He speaks at corporates, educational institutes, government bodies and volunteer agencies.