He has even dubbed some emotional dialogues for some of his superstar leading ladies from Mumbai when they've not been able to get their dramatic pitch right.
But his latest role as a lyric writer for Deepa Mehta has taken everyone by surprise.
The sensitive Toronto-based filmmaker has asked her prolific colleague from Kolkata to write a song, and that too in the Bihari Brij Bhasha, for her Amitabh Bachchan period epic Kamagata Maru to be filmed next year.
Exults Deepa, "I think Rituparno is a wonderful humanbeing and an astonishing filmmaker. But when I heard his songs in the Brij Bhasha sung by Shubha Mudgal for Raincoat which he had written I knew I had found my lyricist for Kamagata Maru. The song will be filmed on a homesick nostalgia-driven Bihari traveling far away from home."
Ritu has agreed to do it. " Deepa is someone whom I really respect. And why just her? I"ve also written Bengali dialogues for Mira Nair The Namesake and for a number of Aprana Sen's films including Yugant and her documentary An Unordinary City on Kolkata."