In the titles, three editors are mentioned,
R M Tipnis
Like most people I have been assuming that this Bimal Roy is the well-know Bimal Roy of Bandini and Devdas.
Recently, I was informed by Anirudh Bhattacharjee that this is not so.
He shared an email exchange with Rinky Roy (from 2013) in which she clarified that this was a different man, an editor working in Bombay.
Now You Know!